Air Brake (Q Endorsement) Practice · Question
Maximum allowable air leakage with brakes applied on a tractor-trailer combination is:
Combination vehicles: max 3 psi/min with brakes applied (4 psi/min combination with brakes released in many provinces).
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Question: Maximum allowable air leakage with brakes applied on a tractor-trailer combination is:
Answer options:
- 2 psi/min ✅ 3 psi/min
- 4 psi/min
- 6 psi/min
Correct answer: 3 psi/min
Explanation: Combination vehicles: max 3 psi/min with brakes applied (4 psi/min combination with brakes released in many provinces).
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