SAE J2995_201703

1. SCOPE
2. REFERENCES
3. SYMBOLS AND ABBREVIATED TERMS
4. DEFINITIONS
5. TEST EQUIPMENT
6. DEFAULT VEHICLE TEST CONDITIONS
7. TEST PROCEDURES FOR HYDRAULIC COMPONENTS
8. RECOMMENDED SAMPLING PLAN
9. BASIC PROCESS TO EVALUATE FATIGUE LIFE RELATIVE TO
    VEHICLE LOAD COLLECTIVES
10. THERMAL STRESS
11. PARKING BRAKE ACTUATOR ENDURANCE TEST
12. HYDRAULIC LEAKAGE TEST
13. GUIDELINES FOR FAILURE MODES AND FAILURE MODE EVALUATION
14. NOTES
APPENDIX A - DETERMINATION OF NUMBER OF SAMPLES AND NUMBER CYCLES
             OTHER THAN DEFAULT SAMPLING PLAN
APPENDIX B - DETERMINATION OF TORQUE AND PRESSURE CYCLES FROM LOAD
             COLLECTIVE FROM VEHICLE MEASUREMENTS
APPENDIX C - TABULAR LIST OF MAIN INTERNATIONAL TEST PROCEDURES FOR
             HYDRAULIC COMPONENTS

To assess the strength and durability for hydraulic brake components as a function of test conditions.

To assess the strength and durability for hydraulic brake components as a function of test conditions. These conditions may include: braking torque, hill-holding, braking forces, hydraulic pressure, brake temperatures, environmental and corrosion effects, vibration, and time. This RP includes a systematic reference to other test methods and provides new test methods for durability life prediction based on the VDA 311 for operating strength for brake calipers. When using AK load collectives from vehicle testing for life prediction, the nominal vehicle life corresponds to 300000 km. Braking torques and forces take into account inputs from non-ABS, ABS, EPB, and ESC systems. It also applies to gasoline, diesel, hybrid, and electric vehicles. This RP applies to vehicles below 4540 kg of GVWR. With the appropriate engineering review and assessment for a given test program, this RP can apply (or be used) to scale the duty cycle (or special collective) to reflect regional, on-road special applications, or vehicles up to 7 tons of GVWR.Except for the AK load collectives, which have proven correlation to customer usage, the damage content of other procedures requires (a) the quantification with actual laboratory testing to develop the corresponding S/N curves, and (b) the calculation of the equivalent damage at the test conditions for a given load collective.The hydraulic components covered by this RP include:aNon-vacuum apply system (brake booster and master cylinder)bABS modulescService, IPB, and EPB calipersdProportioning valveseWheel cylindersThis RP has an accompanying electronic appendix with the tabular presentation as a spreadsheet of different test procedures by type and by component.