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

A 3 psi in one minute.

The driver then holds the foot brake for 1 minute after stabilization of the air gauge. The driver checks the air gauge to see that the air pressure drops no more than 3 pounds in one minute (single vehicle) or 4 pounds in 1 minute (combination vehicle) and listens for air leaks.