With the engine off, the brakes released and your foot on the brake pedal, a combination vehicle air brake system should not leak more than how many psi in 1 minute?
A. 1
B. 2
C. 4
Answer: C. 4
CDL MCQ
CDL
With the engine off, the brakes released and your foot on the brake pedal, a combination vehicle air brake system should not leak more than how many psi in 1 minute?
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