When testing air brakes, after releasing the service brake, the pressure drop should be:
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ANSWER
✓No more than 3 psi in one minute for a single vehicle
No more than 10 psi in one minute
No more than 1 psi in one minute
There should be zero pressure drop at any time
Why: When the engine is off and parking brakes are released, the service brake application should not cause a pressure drop of more than 3 psi per minute on a single vehicle, or 4 psi per minute on a combination vehicle.