Scenario 38: Maximum allowable air leakage with brakes applied on a tractor-trailer combination is:

Question: Scenario 38: 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). The correct answer is "3 psi/min". This capacity-fill scenario 38 reinforces the same competency for the airbrake bank and follows the certified explanation standard.