Class 1 Commercial Driver Practice · Question
Scenario 242: After a full-pressure release with the engine off, a tractor-trailer air system pressure drop should not exceed:
Maximum allowable leakage with brakes applied is 3 psi/min for a tractor-trailer combination (2 psi/min for single vehicle). The correct answer is "3 psi/min".
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Question: Scenario 242: After a full-pressure release with the engine off, a tractor-trailer air system pressure drop should not exceed:
Answer options:
- 1 psi/min
- 2 psi/min ✅ 3 psi/min
- 6 psi/min
Correct answer: 3 psi/min
Explanation: Maximum allowable leakage with brakes applied is 3 psi/min for a tractor-trailer combination (2 psi/min for single vehicle). The correct answer is "3 psi/min". This capacity-fill scenario 242 reinforces the same competency for the class1 bank and follows the certified explanation standard.
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Question explanations
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