Class 2 Commercial Driver Practice · Question
Maximum allowable air leakage with brakes applied on a single-unit bus is:
Single-vehicle leakage limit is 2 psi/min (3 psi/min for tractor-trailer).
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Question: Maximum allowable air leakage with brakes applied on a single-unit bus is:
Answer options: ✅ 2 psi/min
- 3 psi/min
- 5 psi/min
- 10 psi/min
Correct answer: 2 psi/min
Explanation: Single-vehicle leakage limit is 2 psi/min (3 psi/min for tractor-trailer).
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