Air Brake Actuator Test Procedure, Truck-Tractor, Bus, and Trailers
This SAE Recommended Practice provides procedures and methods for testing service, spring applied parking, and
combination brake actuators with respect to durability, function, and environmental performance. A minimum of five test
units designated A, B, C, D, and E are to be used to perform all tests per 1.1 and 1.2.
1.1 Test Procedures
Leak rate-parking and service chambers (Section 4)
Chamber volume-parking and service chambers (Section 5)
Maximum release and hold-off pressure-parking chamber (Section 6)
Minimum Pressure Response-Service Chambers (Section 7)
Force output and stroke-parking chamber (Section 8)
Force output and stroke-service chamber (Section 9)
Low temperature leakage-parking and service chambers (Section 10)
Low temperature maximum release and hold-off pressure (Section 11)
Low temperature force output-parking chamber (Section 12)
Low temperature operational test-service chamber (Section 13)
Rationale: New changes addressed requests to increase the Salt Spray Requirements, add Vacuum Requirements to Boot Seal
Validation, allow longer pressure stabilization times during leak testing, add allowable cooling time between mechanical
release test cycles, allow optional 5 Gallon Air Tank reservoir for pressure decay leak testing, standardize incremental
measurements to 5 mm (0.20 in), and add Arctic temperature Leakage and Operational testing to allow the SAE J1450
specification to be suspended or cancelled.
Braking systemsAir brakesSensors and actuatorsPerformance testsTrailers
Also known as: SAE J 1469
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