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.

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)

Corrosion resistance-parking and service chamber (Section 14)

Mechanical back-off release mechanism (Section 15)

Proof pressure test-parking and service chambers (Section 16)

Cycle test-parking chamber (Section 17)

Cycle test-service chamber (Section 18)

Elevated temperature cycle test-parking and service chambers (Section 19)

Vibration test (Section 20)

Arctic temperature leakage – service chamber (Section 21)

Arctic temperature operational test – service chamber (Section 22)

Test Sequence Chart

The test sequence as charted in the "Test Sequence Chart" shall be mandatory (see Figure 1).

Purpose

This document provides uniform procedures and methods for laboratory testing of brake actuators used in air brake systems.

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