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Commercial Driver’s License (CDL) Practice Exam

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As per regulations, how much pressure can combination vehicles with air brakes lose in one minute with the engine off and brakes released?
Correct Answer:
3 PSI
Explanation:
Combination vehicles equipped with air brakes are required to maintain an acceptable level of air pressure loss when the engine is off and the brakes are released. The regulation permits a maximum loss of 3 PSI (pounds per square inch) in one minute. This standard is put in place to ensure the integrity of the air brake system, which is critical for safe operation, particularly under load. A loss greater than the allowed amount may indicate potential leaks or issues within the air brake system, which could compromise overall braking performance and vehicle safety. By adhering to this regulation, drivers can detect potential problems early and conduct necessary maintenance or repairs, ensuring the vehicle remains in safe operating condition.

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