Home › CDL Practice Tests › Air Brakes Questions › Question 73
With the engine off and brakes released, what is the maximum allowable leakage rate for a combination vehicle?
- A.No more than 3 psi per minute
- B.No more than 1 psi per minute
- C.No more than 6 psi per minute
- D.No limit applies to combinations
Correct answer
A. No more than 3 psi per minute
Why
Combinations have more tanks, lines, and connections, so the static limit is slightly higher at 3 psi per minute. Beyond that, the extra loss signals a leak to find before departure.
Manual topic: Air Brakes - Air Leakage and Brake Tests · From the Air Brakes practice bank (AB-073).