Browse Topic: Brake fluids

Items (190)
Find
Comparative Numerical Study on Heat Dissipation Behaviour of Conventional Disk Brake Designs for High-Performance Requirements.2022-28-042211/09/2022
The braking system of a vehicle is one of the most crucial parts for proper and safe operation. It is required to slow down and/or stop the vehicle and work by converting the kinetic energy of the wheel to heat. It is essential to dissipate the generated heat for optimal working and the long life of the disc brakes. Most of the complications and failures with a brake disc are due to problems with heat distribution and heat level absorbed by the disc. The heat is generated due to friction between the brake pad and disc. Due to overheating of brakes due to prolonged braking and heavy braking, brake fade occurs which leads to boiling of the brake fluid, gassing, and glazing of brake pads and hence reducing braking performance. Therefore, in this project, our aim is to determine the best design that allows for the most heat dissipation by analyzing four different disc brakes using computer simulations i.e CFD to study the effect on airflow and convection and FEA for thermal analysis. This
Arora, Rishabh, Rao, Vikram, Sharma, Rishab, Chahal, Rujul, Singh, Manvesh
Brake Line Repair: An Evaluation 2022-01-100103/29/2022
Brake line failures do occur, and it can happen to any vehicle. However, due to the FMVSS requirements, the brake line systems are also designed to maintain certain braking capability in the event of a brake line failure. This study was intended to further understand the effects of a brake line failure and examine the braking capability and controllability of the vehicle. A minivan was used as the test vehicle for this research. One of the brake lines of the minivan was cut and then reconnected with a compression fitting. When the compression fitting is not fully tightened, it will allow brake fluid leakage, and in the tests, the brake fluid was completely drained to simulate the empty brake fluid reservoir by repeatedly pushing the brake pedal. After the test vehicle lost all the brake fluid, braking tests were conducted. The stopping distance and the tire marks on the ground were documented. The test results show contrary to the unfounded myth that a brake line failure will result in
Arnett, Michael, Chen, H. Fred, Guenther, Dennis
Service Maintenance of SAE J1703 and SAE J1704 Brake Fluids in Motor Vehicle Brake SystemsJ1707_202106 (Current)06/10/2021
This SAE Recommended Practice provides basic recommendations for dispensing and handling of SAE J1703 and SAE J1704 Brake Fluids by Service Maintenance Personnel to assure their safe and effective performance when installed in or added to motor vehicle hydraulic brake actuating systems. This document is concerned only with brake fluid and those system parts in contact with it. It describes general maintenance procedures that constitute good practice and that should be employed to help assure a properly functioning brake system. Recommendations that promote safety are emphasized. Specific step-by-step service instructions for brake maintenance on individual makes or models are neither intended nor implied. For these, one should consult the vehicle manufacturer’s service brake maintenance procedures for the particular vehicle. Vehicle manufacturer’s recommendations should always be followed.
Brake Fluids Standards Committee
Low Water Tolerant Brake FluidsJ1705_202105 (Current)05/28/2021
This SAE Recommended Practice was prepared to provide engineers, designers, and manufacturers of motor vehicles with a set of minimum performance requirements in order to assess the suitability of silicone and other low water tolerant type brake fluids (LWTFs) for use in motor vehicle brake systems. These fluids are designed for use in braking systems fitted with rubber cups and seals made from styrene-butadiene rubber (SBR), or a terpolymer of ethylene, propylene, and a diene (EPDM). In the development of the recommended requirements and test procedures contained herein, it is concluded that the LWTFs must be functionally compatible with braking systems designed for SAE J1703 and SAE J1704 fluids. To utilize LWTFs to the fullest advantage, they should not be mixed with other brake fluids. Inadvertent mixtures of LWTFs with fluids meeting SAE J1703 are not known to have any adverse effects on performance, but not all combinations have been tested. Vehicle manufacturer’s recommendations
Brake Fluids Standards Committee
Low Water Tolerant Brake FluidsJ1705_202105-TEST-REC (Historical)05/28/2021
This SAE Recommended Practice was prepared to provide engineers, designers, and manufacturers of motor vehicles with a set of minimum performance requirements in order to assess the suitability of silicone and other low water tolerant type brake fluids (LWTFs) for use in motor vehicle brake systems. These fluids are designed for use in braking systems fitted with rubber cups and seals made from styrene-butadiene rubber (SBR), or a terpolymer of ethylene, propylene, and a diene (EPDM). In the development of the recommended requirements and test procedures contained herein, it is concluded that the LWTFs must be functionally compatible with braking systems designed for SAE J1703 and SAE J1704 fluids. To utilize LWTFs to the fullest advantage, they should not be mixed with other brake fluids. Inadvertent mixtures of LWTFs with fluids meeting SAE J1703 are not known to have any adverse effects on performance, but not all combinations have been tested. Vehicle manufacturer’s recommendations
Brake Fluids Standards Committee
BMW reveals its first “M” performance-badged two-wheeler20AUTP11_1111/01/2020
BMW has revealed its first-ever M-badged motorcycle, the M 1000 RR superbike. A heavily reworked version of the already-capable S 1000 RR sportbike, the new machine is riding the trend of track-focused machines, as the motorcycle industry watches sportbike sales follow the same path as sedans in the automotive world. BMW's highly regarded Motorsports division produced its first racecar (the 3.0 CSL) in 1972 and its first road-going car with the mid-engine M1 in 1978. Since then, the Munich-based auto- and motorrad-maker has since produced an M version of nearly every car it has manufactured, the 7 Series being a notable exception.
Seredynski, Paul
Low-Duty Inertia Dynamometer Hydraulic Brake Wear Test Procedures for Vehicles Above 4536 kg (10000 pounds) of GVWRJ3006_202005 (Current)05/26/2020
This Recommended Practice is derived from OEM and tier-1 laboratory tests and applies to two-axle multipurpose passenger vehicles, or trucks with a GVWR above 4536 kg (10 000 pounds) equipped with hydraulic disc or drum service brakes. Before conducting testing for a specific brake sizes or under specific test conditions, review, agree upon, and document with the test requestor any deviations from the test procedure. Also, the applicable criteria for the final test results and wear rates deemed as significantly different require definition, assessment, and proper documentation; especially as this will determine whether or not Method B testing is needed. This Recommended Practice does not evaluate or quantify other brake system characteristics such as performance, noise, judder, ABS performance, or braking under extreme temperatures or speeds. Minimum performance requirements are not part of this recommended practice. Consistency and margin of pass/fail of the minimum requirements
Truck and Bus Hydraulic Brake Committee
Research on Compensation Redundancy Control for Basic Force Boosting Failure of Electro-Booster Brake System2020-01-021604/14/2020
As a new brake-by-wire solution, the electro-booster (Ebooster) brake system can work with the electronic stability program (ESP) equipped in the real vehicle to realize various excellent functions such as basic force boosting (BFB), active braking and energy recovery, which is promoting the development of smart vehicles. Among them, the BFB is the function of Ebooster's servo force to assist the driver's brake pedal force establishing high-intensity braking pressure. After the BFB function failure of the Ebooster, it was not possible to provide sufficient brake pressure for the driver's normal braking, and eventually led to traffic accidents. In this paper, a compensation redundancy control strategy based on ESP is proposed for the BFB failure of the self-designed Ebooster. Firstly, introduced the working principle of Ebooster and ESP, and a suitable pressure-building circuit was selected for the dual brake actuator system; Secondly, after the BFB failure of Ebooster, the rule-based
Zhao, Jian, Chen, Zhicheng, Zhu, Bing, Wu, Jian
A Study on the Optimum Reduction of Required Brake Fluid Level for Improvement of the High Speed Continuous Brake Distance2019-01-212109/15/2019
The high speed continuous braking distance assessment is the worst condition for thermal fades. This study was conducted to investigate the relationship between fade characteristic and friction materials & brake fluid amount for improving braking distance. So, we used the dynamometer to measure the friction coefficient, braking distance and required brake fluid amount. Through the measurements, the research was carried out as follows. First of all, we studied the influence of friction coefficient about different shapes (chamfer shape, area of the friction material, number of slots) on the same friction material. Secondly, we knew the effects of braking distance by the shape of the friction material. Through these two studies, the shape of the friction material favorable to the fade characteristics was derived. Finally, we measured the amount of required brake fluid in caliper after 10 consecutive braking cycles through Dynamometer. And then, we measured the amount of compression
Kim, Junggyu, Kim, Kwang Yun, So, Eue-sub
High-Preload Deflection and Compressibility Test Procedures for Friction MaterialsJ2468_201811 (Current)11/12/2018
This standard specifies a method for testing and measuring the deflection of friction materials assemblies and compressibility of friction materials. This standard applies to disc brake pad assemblies and its coupons or segments, brake shoe lining and its coupons or segments, and brake blocks segments used in road vehicles. This SAE test method is consistent in intent with the ISO 6310 and the JIS 4413.
Brake Linings Standards Committee
Compressible Brake Fluid Turbulent Flow Simulation and Experimental Verification on Brake Bleeding Performance Improvements of an EPB Caliper2018-01-187610/05/2018
Brake bleeding is the process of removing air bubbles present on hydraulic brake systems from the master cylinder to the calipers of a vehicle, including the brake pipes and hoses. This is very important procedure affecting on brake performance, but still has been a key issue in automobile industry for last decades because reaching best bleeding performance has a limit that there is always remaining air in brake system. In this paper, it is reported on numerical and experimental investigations into the topic of bleeding performance improvements. Compressible brake fluid turbulent flow simulation with two-phase mixture model was performed to investigate the details of the bleeding performance drop during its cycles. The rig test of the hollow cylinder was carried out in order to secure the brake consumption amount curve whose results were used for the criterion of the parametric simulations using Tait equation to estimate the property of the brake fluid with the bulk modulus of 19,535
Mo, Jang-Oh
Motor Vehicle Brake Fluid Container CompatibilityJ75_201807 (Current)07/12/2018
Motor vehicle brake fluid must conform to the requirements of SAE J1703 or J1704, not only when manufactured, but also after extended storage in any commercial packaging container. The purpose of this SAE Information Report is to generate an awareness of the major problems involved in the storage of brake fluids and, to some extent, provide means of circumventing them. It is also the purpose of this document to relate to experience and to test data accumulated and to list certain conclusions which should aid in the proper selection of containers for brake fluid.
Brake Fluids Standards Committee
Production, Handling, and Dispensing of SAE J1703 Motor Vehicle Brake Fluids and J1704 Borate Ester Based Brake FluidsJ1706_201706 (Historical)06/09/2017
This SAE Recommended Practice is intended to provide basic recommended practices for aid in the development and use of safe and efficient practices for all operations involving the production, handling, and dispensing of SAE J1703 Motor Vehicle Brake Fluids and SAE J1704 Borate Ester Based Brake Fluids.
Brake Fluids Standards Committee
Copper-Free NAO Brake Pad Formulation with Improved Electrostatic Paintability Based on Conductive Carbon Powders2016-01-191609/18/2016
A wide range of different carbon powders is available and currently used in friction materials like coke, graphite and carbon black. The effect of the type of carbon on braking performance has been extensively investigated in the past and it has been demonstrated that graphite can play an important role in copper-free brake pads. However, there are no studies about the influence of carbon powders on the processability of brake pads. Brake pads need to be painted in order to avoid corrosion. Typically electrostatic painting is used on an industrial scale, which requires the brake pads to be conductive. NAO brake pads (and especially Cu-free NAO brake pads) are rather insulating, and therefore difficult to paint. In this presentation we’ll show how special carbon powders can increase the electrical conductivity and therefore allow easy painting of brake pads. Based on these investigations, a new copper-free NAO formulation has been developed. This new formulation shows good performance
Gilardi, Raffaele, Sarocchi, Davide, Bounous, Loredana
Service Maintenance of SAE J1703 and J1704 Brake Fluids in Motor Vehicle Brake SystemsJ1707_201609 (Historical)09/13/2016
This SAE Recommended Practice provides basic recommendations for dispensing and handling of SAE J1703 and SAE J1704 Brake Fluids by Service Maintenance Personnel to assure their safe and effective performance when installed in or added to motor vehicle hydraulic brake actuating systems. This document is concerned only with brake fluid and those system parts in contact with it. It describes general maintenance procedures that constitute good practice and that should be employed to help assure a properly functioning brake system. Recommendations that promote safety are emphasized. Specific step-by-step service instructions for brake maintenance on individual makes or models are neither intended nor implied. For these, one should consult the vehicle manufacturer’s service brake maintenance procedures for the particular vehicle. Vehicle manufacturer’s recommendations should always be followed.
Brake Fluids Standards Committee
Rubber Boots for Drum-Type Hydraulic Brake Wheel CylindersJ1604_201512 (Current)12/17/2015
This SAE Standard covers molded rubber boots used as end closures on drum-type wheel brake actuating cylinders to prevent the entrance of dirt and moisture, which could cause corrosion and otherwise impair wheel brake operation. The document includes performance tests of brake cylinder boots of both plain and insert types under specified conditions and does not include requirements relating to chemical composition, tensile strength, or elongation of the rubber compound. Further, it does not cover the strength of the adhesion of rubber to the insert material where an insert is used. The rubber material used in these boots is classified as suitable for operation in a temperature range of −40 to +120 °C ± 2 °C (−40 to + 248 °F ± 3.6 °F).
Hydraulic Brake Components Standards Committee
Proposed Metrological Method for Identifying Automotive Brake Discs2015-01-069104/14/2015
The main aim of this work is to develop an identification method to demonstrate the crucial surfaces of automotive braking system. Two brand new brake discs manufactured by two different manufacturers are tested. A typical disc to the one of them was put under working condition in actual braking system. Dimensional and geometrical deviations are investigated using advanced engineering metrological technique. Mechanical properties, tribological characteristics and chemical analyses are investigated. A coordinate measuring machine, universal hardness tester, mass comparator and XRF spectrometer are used in these diagnoses. Measurements of dimensional and geometrical deviations such as disc thickness variations, thickness deviations, straightness, parallelism, runout of disc surfaces are conducted. A comparison between form deviations in disc surfaces have been carried out and analyzed. The effect of material properties of the influencing surfaces on the wear rate and hardening of
Ali, Salah H. R., Zahwi, Sarwat Z. A., Dadoura, Hassan H.
Hardware-in-the-loop Simulation for an Integrated Braking System2015-01-158204/14/2015
Comparing with traditional braking systems of automobiles, the brake-by-wire (BBW) system has a faster dynamic response and is more suitable for applications that facilitate regenerative braking. As the two main categories of BBW systems, the well-known electro-hydraulic braking system and electro- mechanical braking system are not compact enough and their fail-safe function has always been a worrying aspect. A new BBW system called integrated braking system (IBS) by employing the hydraulic multiplex method was proposed in recent years. The IBS implements power-assisted braking and active braking by means of just an integrated unit. It can certainly be used for ABS, ASR and ESC systems for building up and reducing brake pressure. Presented in the paper is a new structure of IBS, which is mainly composed of a motor, ball screw, master cylinder and four 2/2-way valves. The main parameters of the system and performance requirements of the motor are determined by means of simulation in
Yong, Jiawang, Gao, Feng, Ding, Nenggen, Wang, Wei, Hu, Xianrong
Accurate Speed Control of the DC Motor for Anti-Lock Braking System2015-01-065404/14/2015
The permanent-magnet DC motor, which is directly connected to the hydraulic pump, is a significant component of hydraulic control unit (HCU) in an anti-lock braking system (ABS). It drives the pump to dump the brake fluid from the low-pressure accumulator back to master cylinder and makes sure the pressure decreases of wheel cylinder in ABS control. Obviously, the motor should run fast enough to provide sufficient power and prevent the low-pressure accumulator from fully charging. However, the pump don't need always run at full speed for the consideration of energy conservation and noise reduction. Therefore, it is necessary to accurately regulate the speed of the DC motor in order to improve quality of ABS control. In this paper, an accurate speed control algorithm was developed for the permanent-magnet DC motor of the ABS to implement the performance of the system, reduce the noise and save the energy in the meanwhile. Firstly, the hydraulic brake system and the DC motor models of
Zhu, Bing, Gong, Jiapeng, Zhao, Jian, Wu, Jian, Deng, Weiwen
Brake Master Cylinder Reservoir Diaphragm GasketJ1605_201411 (Current)11/26/2014
This SAE Standard covers performance requirements and methods of test for master cylinder reservoir diaphragm gaskets that will provide a functional seal and protection from outside dirt and water.
Hydraulic Brake Components Standards Committee
ASURT Formula Student Brake Design2014-01-248709/28/2014
The Braking System is the most crucial part of the racing vehicle. There is no doubt, that if only one minority failure in the braking system took place, this would be more than enough reason to cause the racing team disqualification from the competition. Time is the main and the most important criteria for any racing competition; on the other hand the formula student “FS UK SAE” competition care the most about developing the automotive engineering sense in the students by putting them under strict rules normally taken from the original version “formula 1” to encourage their creativity to reach the optimum performance under these strict rules. One of the most important rules is “No Braking by wire”, and the obvious consequences are more stopping distance and time. Braking distance is a critical facture in achieving racing success in a competitive domain. This report will cover using the bias bar, dynamic weight distribution “before and after braking” and carefully choosing the braking
Barakat, Mohamed Samy
Simulated Mountain-Brake Performance Test ProcedureJ1247_201405 (Current)05/16/2014
This SAE Recommended Practice establishes a uniform procedure for a flat-road simulation of a mountain-fade test of the brake systems of light-duty trucks and multipurpose passenger vehicles up to and including 4500 kg (10 000 lb) GVW and all classes of passenger cars.
Road Test Procedures Standards Committee
Scope of Regenerative (Magnetic) Braking in the Production of Electricity in Automobiles2013-01-254310/14/2013
It is of common knowledge that tapping all the feasible sources of energy and systems which prevent losses is the need of the hour. Currently, many such systems have been developed including “REGENERATIVE BRAKING”. The usual method for regenerative braking includes using a dynamo attached to the crankshaft which gets charged when the wheel rotates during idling. However, this study aims at doing this differently by attaching the regenerative system at the wheels. Considering an example of wastage of energy, a 1000 kg car brakes from 36km/h (10m/s) to 18km/h (5m/s) about 150 times in a liter consumption of diesel. We can safely calculate wastage of 5625 KJ of kinetic energy. This paper aims to explore this immense potential source of energy recovery by producing & storing electricity using magnetic braking on wheels of automobiles. Also, the location of the magnetic braking system ensures that the heat produced is dissipated fast enough, which is unlike conventional regenerative braking
Kaul, Satya, Gupta, Jaideep, Sharma, Shubham, Kumar, Naveen
Characterization of Caliper Piston Material Stiffness and Damping2013-01-205009/30/2013
The brake caliper piston plays a key role in caliper function, taking significant responsibility for qualities such as fluid consumption, insulation of the brake fluid from heat, seal rollback function, and brake torque variation sensitivity to disc thickness variation. It operates in a strenuous environment, being routinely subjected to high stresses and elevated temperatures. Given all of the demands on this safety-critical component (strength, stiffness, wear resistance, stable friction against rubber, thermal stability, machinability, manageable thermal conductivity, and more), there are actually relatively few engineering materials suitable for use as a caliper piston, and designs tend to be limited to steel, aluminum, and engineered plastics (phenolic composites). The lattermost - phenolic composites - has been of especial interest recently due to mass savings and possible reduction in brake corner judder sensitivity to disc thickness variation. This paper focuses on
Antanaitis, David B., Riefe, Mark, Ciechoski, Chris, Flaim, Thomas, Greening, C
Hydraulic Wheel Cylinders for Automotive Drum BrakesJ101_201307 (Current)07/09/2013
This document specifies minimum performance and durability requirements for satisfactory vehicle usage, and it is applicable to wheel cylinder assemblies from commercial production, after production shipment, shelf storage, and remanufacture (factory rebuild).
Hydraulic Brake Components Standards Committee
Brake Duty Cycle Simulation for Thermal Design of Vehicle Braking System2013-36-001505/15/2013
Successive braking of the vehicle, hereinafter referred as brake duty cycle, can elevate the temperature of the brake disc to a very high level. Such high temperatures reached in brake discs can lead to vaporization of the brake fluid if the vehicle is at rest after the brake duty cycle. Excessive temperature operation of the brake disc can also lead to thermal cracks, judder, brake fade, wear and reduce braking effectiveness. Simulation tools can be used to predict the excessive temperature reached during successive braking event. After visualizing the complex flow field over the brake system and analyzing the heat transfer from brake system, simulations can be employed at the early design stage to optimize the design for more airflow over brake discs thus reducing the high temperatures and associated brake fade. In this paper, a CFD model of the vehicle with brake system is coupled with a thermal solver at braking and acceleration velocities. Heat input due to conversion of Kinetic
Bhambare, K., Haffey, M., Jelic, S.
Determination of Brake Fluid TemperatureJ291_201304 (Current)04/09/2013
This code provides a test procedure for obtaining and determining extremely high brake fluid temperature encountered in the brake system of a vehicle that is equipped with disc brakes. Vehicles in normal operation may or may not produce brake fluid temperatures that are obtained in this procedure.
Road Test Procedures Standards Committee
Multi-Disciplinary Analyses for Brake Fluid Temperature Evaluation2013-01-063504/08/2013
During braking events, a brake corner sustains high brake torque, generating a large amount of heat in the process. This is most significant during mountain descent events and vehicle race track events. The brake thermal events not only reduce brake friction coefficient and lining life, but also produce elevated brake fluid temperature. Traditionally, brake hardware testing is warranted to evaluate brake fluid temperature for high speed flat track and mountain descent. These tests are costly and time-consuming. A CAE process to predict brake fluid temperature early in the vehicle development process before hardware exists, and to reduce and to replace testing will greatly benefit the vehicle development process. To this end, multiple analyses can be run. The heat transfer coefficients and cooling coefficients were evaluated from relevant CFD analyses. Then BrakePro and CarSim were run to evaluate appropriate brake flat track temperature profiles and simulated mountain schedule
Shi, Tinghui, Nisonger, Robert
Thermomechanical Stress Analysis of Vehicles Gray Cast Brake2013-01-087704/08/2013
The main purpose of this study is to analyze the thermomechanical behavior of the dry contact between the brake disc and pads during the braking phase. The simulation strategy is based on computer code ANSYS11. The modeling of transient temperature in the disc is actually used to identify the factor of geometric design of the disc to install the ventilation system in vehicles. The thermal-structural analysis is then used with coupling to determine the deformation and the Von Mises stress established in the disk, the contact pressure distribution in pads. The results are satisfactory when compared to those of the specialized literature.
Belhocine, Ali, Mostefa, Bouchetara
Structural Testing of Passenger Car and Truck Disc BrakesJ1713_201302 (Historical)02/13/2013
This SAE Recommended Practices specifies a procedure for determining structural strength and fatigue life of disc-brake caliper assemblies which are satisfactory for vehicle usage. It is applicable to new caliper assemblies which are employed in passenger car and truck brake systems utilizing hydraulic brake fluids. Brake design and vehicle performance requirements are not included. Specification limits are left to the discretion of the responsible manufacturer. This procedure was developed for base brake operation and does not consider some unusual effects of ABS (Anti-Lock-Brake System) or Traction Control systems which may have a significant effect on the caliper. Careful analysis of the particular type ABS and/or Traction Control should be made and additional tests may be required which are not included in this document.
Hydraulic Brake Components Standards Committee
Hydraulic Valves for Motor Vehicle Brake Systems - Performance RequirementsJ1137_201212 (Current)12/03/2012
This SAE Recommended Practice applies to valve assemblies that are used on passenger car and light truck braking systems utilizing motor vehicle hydraulic brake fluids. The procedure (SAE J1118) and these requirements (SAE J1137) were developed for brake fluids conforming to SAE J1703 and FMVSS 116 (DOT 3) requirements; however, it may be utilized for valves which use DOT 4 or DOT 5 brake fluid. These requirements are applicable to differential warning, metering hold off, bypass function, or proportioning type valves or any combination thereof.
Hydraulic Brake Components Standards Committee
Materials for Plastic Pistons for Hydraulic Disc Brake CylindersJ1568_201204 (Current)04/30/2012
The materials defined by this SAE Standard are glass-fiber-reinforced, mineral-filled phenolic molding compounds suitable for compression molding. Preforms may be radio frequency preheated or screw preheated slugs. Compound for use in hydraulic disc brake caliper pistons.
Hydraulic Brake Components Standards Committee
Shelf Storage of Hydraulic Brake ComponentsJ1825_201204 (Current)04/30/2012
This SAE Information Report is the listing of recommendations for shelf storage for hydraulic brake components. Included in brake components are wheel cylinders, master cylinders, combination valves, and disc brake caliper assemblies. This document is not a specification. This document embodies the analyses and experiences of many users and manufacturers. Where specific manufacturers' recommendations are made, those recommendations shall supersede the recommendations of this document. This document lists the successful procedures and practices associated with brake components based on long experience of a wide cross section of manufacturers and users. The practices are expected to be applied to all brake components where SAE standards are applicable.
Hydraulic Brake Components Standards Committee
Rubber Dust Boots for the Hydraulic Disk Brake PistonJ1570_201204 (Current)04/30/2012
This SAE Standard covers molded rubber boots used on disc brake pistons to prevent the entrance of dirt and moisture which could cause corrosion and otherwise impair caliper operation. The specification includes performance tests of brake piston boots of both plain and insert types under specified conditions and does not include requirements relating to chemical composition or physical properties of the rubber compound. Further, it does not cover the strength of the adhesion of rubber to the insert material where an insert is used. The rubber material used in these boots is classified as suitable for operating in a temperature range of -40 to + 120 °C ± 2 °C (-40 to + 248 °F ± 3.6 °F).
Hydraulic Brake Components Standards Committee
Remanufactured Hydraulic Master Cylinder for Motor Vehicle Brakes - Performance RequirementsJ1694_201204 (Current)04/30/2012
This SAE Recommended Practice defines minimum requirements for general characteristics, performance, and durability. It is applicable to remanufactured assemblies (factory rebuild) only. This document applies to master cylinder assemblies and components of current established designs but does not cover fluid level sensors, integral proportioning valves, or those master cylinders used in anti-lock brake or traction control systems. These will be covered by other standards. The general characteristics and test procedure are specified in SAE J1693.
Hydraulic Brake Components Standards Committee
Remanufactured Hydraulic Master Cylinder for Motor Vehicle Brakes - General Characteristics and Test ProcedureJ1693_201204 (Current)04/30/2012
This SAE Recommended Practice specifies the general characteristics and test procedure to define the minimum characteristics, performance, and durability requirements. It is applicable to remanufactured assemblies (factory rebuild) only. This document applies to master cylinder assemblies and components of current established designs but does not cover fluid level sensors, integral proportioning valves or those master cylinders used in anti-lock brake or traction control systems. These will be covered by other standards. The minimum characteristics, performance, and durability requirements are specified in SAE J1694.
Hydraulic Brake Components Standards Committee
Hydraulic Master Cylinders for Motor Vehicle Brakes - Performance RequirementsJ1154_201202 (Current)02/17/2012
This SAE Standard specifies minimum performance and durability requirements for master cylinder assemblies of current established designs, components of which conform to SAE Standards. It is applicable to new assemblies from commercial production and remanufacture (factory rebuild). These performance requirements are based on those generally used by individual companies in the industry and have demonstrated satisfactory component field performance.
Hydraulic Brake Components Standards Committee
Hydraulic Master Cylinders for Motor Vehicle Brakes Test ProcedureJ1153_201202 (Current)02/17/2012
This SAE Standard specifies the test procedure to determine minimum performance and durability characteristics for master cylinder assemblies of current established designs, components of which conform to SAE Standards. It is applicable to new assemblies from commercial production and remanufacture (factory rebuild). The minimum performance and durability requirements are specified in SAE J1154.
Hydraulic Brake Components Standards Committee
Moisture Transmission Test Procedure - Hydraulic Brake Hose AssembliesJ1873_201202 (Current)02/16/2012
This SAE Recommended Practice is intended for all vehicle hydraulic brake hoses. It is an accelerated test which is intended to provide the user with a method of comparing the ability of hydraulic brake hose designs to retard the ingress of moisture into brake fluid. This document specifies a laboratory performance requirement. ASTM D 1364 interlaboratory reproducibility and correlation of data have not been defined, nor has correlation been established between field vehicle brake fluid moisture content and data obtained by this document.
Automotive Brake and Steering Hose Standards Comm
Production, Handling, and Dispensing of SAE J1703 Motor Vehicle Brake Fluids and J1704 Borate Ester Based Brake FluidsJ1706_201202 (Historical)02/06/2012
This SAE Recommended Practice is intended to provide basic recommended practices for aid in the development and use of safe and efficient practices for all operations involving the production, handling, and dispensing of SAE J1703 Motor Vehicle Brake Fluids and SAE J1704 Borate Ester Based Brake Fluids.
Brake Fluids Standards Committee
Service Maintenance of SAE J1703 and J1704 Brake Fluids in Motor Vehicle Brake SystemsJ1707_201111 (Historical)11/21/2011
This SAE Recommended Practice provides basic recommendations for dispensing and handling of SAE J1703 and SAE J1704 Brake Fluids by Service Maintenance Personnel to assure their safe and effective performance when installed in or added to motor vehicle hydraulic brake actuating systems. This document is concerned only with brake fluid and those system parts in contact with it. It describes general maintenance procedures that constitute good practice and that should be employed to help assure a properly functioning brake system. Recommendations that promote safety are emphasized. Specific step-by-step service instructions for brake maintenance on individual makes or models are neither intended nor implied. For these, one should consult the vehicle manufacturer’s service brake maintenance procedures for the particular vehicle. Vehicle manufacturer’s recommendations should always be followed.
Brake Fluids Standards Committee
Development of an Electrically-Driven Intelligent Brake System for EV2011-39-721105/17/2011
This paper presents the electrically driven intelligent brake system that has been developed for electric vehicles, which are expected to penetrate markets rapidly amid the ongoing energy paradigm shift. This brake system achieves a cooperative energy regeneration function and high responsiveness while providing braking performance, system reliability and vehicle mounting ease equal to that of conventional brake systems with a vacuum booster. This paper outlines the newly developed brake system and describes how to decide the target brake force which is achieved a regenerative braking capability for recovering energy efficiently without sacrificing braking.
Fujiki, Noriaki, Koike, Yuichi, Ito, Yoshinori, Suzuki, Goro, Gotoh, Shinnosuke, Ohtani, Yukio, Yamagucki, Tohma
Rubber Cups for Hydraulic Actuating CylindersJ1601_201103 (Current)03/16/2011
These specifications cover molded cups 51 mm (2 in) in diameter and under, compounded from high temperature resistant rubber for use in hydraulic actuating cylinders employing motor vehicle brake fluid conforming to the requirements specified in SAE J1703 and SAE J1705. These specifications cover the performance tests of hydraulic brake cups under specified conditions and do not include requirements relating to chemical composition, tensile strength, and elongation of the rubber compound. Disc brake seals are not covered by this document.
Hydraulic Brake Components Standards Committee
Rubber Cups for Hydraulic Actuating CylindersJ1601_201103-TEST-REC (Historical)03/16/2011
These specifications cover molded cups 51 mm (2 in) in diameter and under, compounded from high temperature resistant rubber for use in hydraulic actuating cylinders employing motor vehicle brake fluid conforming to the requirements specified in SAE J1703 and SAE J1705. These specifications cover the performance tests of hydraulic brake cups under specified conditions and do not include requirements relating to chemical composition, tensile strength, and elongation of the rubber compound. Disc brake seals are not covered by this document.
Hydraulic Brake Components Standards Committee
Selection of EPDM Elastomer in Brake Hose Application for Improved Brake System Performance2010-01-188510/05/2010
Brake system has been considered as the most important safety system for a vehicle. Performance of the Brake system depends upon various factors like purity of brake fluid, material and construction of rubber hose, rubber seal performance etc. The purity of the brake fluid is one of the most vital factor and incompatibility of the rubber hose with brake fluid causes contamination of the brake fluid. This intern can cause shrinkage / swelling of master, slave cylinder rubber seals. The change in the dimensional of the rubber seals directly affects the performance of the brake system. In order to evaluate the performance of the brake system, Styrene Butadiene Rubber (SBR) and EPDM elastomers with different % of ethylene and varying ENB content were considered for brake fluid compatibility test. These rubber materials were tested in the different brands of DOT 3 brake fluid. Design of experiments has been carried out on EPDM material with different % of ethylene and varying ENB content to
Sivakumar, Anandan, Sathaye, Asmita
Sacrificial Shield for the Wheel Hub Bearing Flange to Maintain Low Brake Rotor Lateral Runout2008-01-254810/12/2008
Corrosion is one of the main issues causing noise, vibration and harshness (NVH) in the wheel-end brake system. This paper describes the development of a sacrificial shield, mounted between the hub bearing unit (HBU) flange and the brake rotor, in order to avoid the forming of corrosion. The zinc (Zn) coated layers on the sheet metal shield provide a chemical defensive mechanism as it takes steel's place in the corrosion reaction. Consequently RED rust will not start forming until all the Zn has been converted to WHITE rust. The duration of the conversion period is the “temporary corrosion protection period” for the HBU and rotor flanges and can maintain the delivered brake rotor Lateral Run Out (LRO) up to the first scheduled service for the rotor. If each time the Sacrificial Shield is replaced when brake rotor service takes place, the proper functioning and service life of the brake system will be prolonged.
Shevket, Cengiz, Zhou, Xiao Bo, Kapaan, Henk
Repeated Brake Temperature Analysis of Ventilated Brake Disc on the Downhill Road2008-01-257110/12/2008
During braking, the kinetic energy and potential energies of a moving vehicle are converted into the thermal energy through frictional heat between the brake disc and the pads. Most of thermal energy dissipated through the brake disc. The object of the present study is simulation of heating and cooling processes of brake disc to investigate temperature field and temperature variation during driving along a downhill road. The velocity of automobile is limited by repeated brake when the speed exceeds to the maximum limited. The pad-disc brake assembly is built by 3D model and applied appropriate boundary condition. In the simulation process, the mechanical loads are applied to the thermo-mechanical coupling model in order to simulate the process of heat produced by friction. The Analysis results are compared to the measured data obtained from the downhill road brake experiment. The temperature field distribution in the disc under repeated braking presents a non-uniformity characteristic.
Hwang, Pyung, Wu, Xuan, Jeon, YoungBae
Borate Ester Based Brake FluidsJ1704_200809 (Historical)09/12/2008
This SAE standard covers motor vehicle brake fluids of the nonpetroleum type for use in the braking system of any motor vehicle such as a passenger car, truck, bus, or trailer. This standard covers different levels of performance properties compared to the SAE J1703 and SAE J1705 documents on brake fluids. These fluids are not intended for use under arctic conditions or in braking systems requiring the use of mineral oil based hydraulic fluid. These fluids are designed for use in braking systems fitted with rubber cups and seals made from styrene-butadiene rubber (SBR), or a terpolymer of ethylene, propylene, and a diene (EPDM).
Brake Fluids Standards Committee
Motor Vehicle Brake FluidJ1703_200808 (Historical)08/29/2008
This SAE Standard covers motor vehicle brake fluids of the nonpetroleum type for use in the braking system of any motor vehicle such as a passenger car, truck, bus, or trailer. These fluids are not intended for use under arctic conditions. These fluids are designed for use in braking systems fitted with rubber cups and seals made from styrene-butadiene rubber (SBR), or a terpolymer of ethylene, propylene, and a diene (EPDM).
Brake Fluids Standards Committee
Identification of Unknown Contaminants in ISS Water Samples Employing Liquid Chromatography/Mass Spectrometry/Mass Spectrometry2008-01-219806/29/2008
Liquid Chromatography / Mass Spectrometry / Mass Spectrometry (LC/MS/MS) is a powerful technique for identifying unknown non-volatile organic compounds dissolved in liquids. One type of LC/MS/MS that is gaining popularity is quadrupole-time-of-flight (QqTOF) mass spectrometry. This technique is now in use at the Johnson Space Center for identification of unknown nonvolatile organics in water samples from the space program. An example of the successful identification of an unknown peak in U.S. Lab Condensate is reviewed in detail in this paper. Each step of the procedure is described in the identification of triethylene glycol mono-n-butyl ether (TGBE) as the unknown analyte. The advantages of time-of-flight instrumentation are demonstrated through this example as well as the strategy employed in using time-of-flight data to identify unknowns. The use of the instrument for quantitative analysis is also demonstrated.
Rutz, Jeffrey A., Schultz, John R., Mudgett, Paul D.
Items per page:
1 – 50 of 190