Question:
With a basically fully-charged air system (within the effective operating range for the compressor), turn off the engine, release all brakes, and let the system settle (air gauge needle stops moving). Time for 1 minute. The air pressure should not drop more than:
- 2 psi for single vehicles.
- 3 psi for a combination of 2 vehicles.
- 5 psi for a combination of 3 or more vehicles.
[California Commercial Driver Handbook]
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