The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:

Question

Accepted Answer

B: 3 psi in one minute.. Assuming that the air system is at normal operating pressure and the engine is off, release all brakes and wait for the air gauge to stop moving. Once stopped, begin timing for 1 minute and the gauge should not lose more than 3 psi for a single vehicle or 4 psi for a combination vehicle.

The air loss rate for a straight truck or bus with the engine off and the brakes on should not be more than:

Illinois CDL Air Brakes Test Info