CDL Vehicle Combination Practice Test

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Prepare for the CDL Vehicle Combination Test. Access multiple choice questions, detailed answers, and hints to guide your study. Ace the exam with confidence!

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What is the maximum allowable air leakage rate for a combination vehicle with the engine off and brakes on?

6 psi per minute
2 psi per minute
4 psi per minute
8 psi per minute

The correct answer is: 4 psi per minute

The maximum allowable air leakage rate for a combination vehicle with the engine off and brakes applied is set at 4 psi per minute. This standard is important for ensuring that the air brake system of the vehicle maintains sufficient pressure to function properly and safely while the vehicle is stationary. Regularly testing for air leakage is a critical part of maintenance, allowing operators to identify potential leaks and address them before they lead to brake failure or inefficient braking performance. By adhering to the specified leakage rate, drivers can ensure that their brakes remain effective, thereby supporting safe driving conditions. It's essential for vehicle operators to understand this benchmark as it directly relates to vehicle safety and operational efficiency.