Brakes
Type of Test | Test Highlights | Equipment Used | Example Procedures |
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Chemical Testing | Measurement of copper, asbestos and other elements in brake friction materials | ICP-OES / PLM | J2975 |
Materials Testing | Physical properties including quality control for friction, wear, compressive strain, shear strength, corrosion resistance, swell and growth | Chase Machine / Compressibility Machine/ Shear Machine / Corrosion Chamber / Environmental Chamber / Oven | J661, ISO 6310, ISO 6311, ISO 6312, ABNT NBR 9301, ABNT NBR 5505, ABNT NBR 5537, ASTM B117 |
Frequency Response | Component Frequency Response | Laser Vibrometer Test Stand | SAE J2933, J3001, J2598, L-4375 |
Structural Fatigue and Durability | Breaking strength, cyclic fatigue | Servo Hydraulics, Torque Flex | J2995, C419, C441, GMW18022 |
Caliper Fingerprinting | Caliper characteristics such as knockback, rollback, fluid displacement, deflection... | Caliper Test Bench / Brake Dynamometer | L-4177, PF.90257 |
Brake Drag and DTV | Residual drag, disc thickness variation, brake feel and vehicle fuel mileage | Off Brake Drag Stand / Brake Dynamometer | J2923, GMW14926, GMW14351, PF.90257, L-13080 |
Performance | Hydraulic, air and electric brakes, friction levels, stopping distance, corrosion, cleanability, brake torque variation, rotor cracking, regulation, stability control, coastdown | Brake Dynamometer, Model 4000 DAS | J2784, J2928 IS026867, GMW14985, PF.90210, PF.90244, L-405, FMVSS 121, FMVSS 122, FMVSS 105, FMVSS 135, FMVSS 126, FMVSS 136, ECE R13H, AMS |
Wear | Rotor wear, drum wear, lining wear, DTV, durability, city traffic, suburban traffic | Brake Dynamometer, Model 4000 DAS | J2707, USCT, L-423, PF.90244, Los Angeles, Detroit, Phoenix, Birmingham, Marquette |
NVH | Brake squeal during drag and decel events at different temperatures, pressure and torque levels | NVH Brake Dynamometer | J2521, L420, 1430, GMW17427, PF. 90244 |
Brake Emissions | Brake dust particle size, count, concentration and mass | Brake Dynamometer | WLTP, CARB, Duty cycle |