Arizona Air Brakes CDL Practice Test

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Study for the Arizona Air Brakes CDL Test. Master the air brake system concepts with flashcards and multiple choice questions, each complemented by hints and explanations. Get exam ready!

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To test the air leakage rate you should...

Leave the engine running and release the service brake
Turn off the engine and release the service brake
Charge the air system and leave the engine running
Depress the brake pedal and monitor the air pressure gauge

The correct answer is: Turn off the engine and release the service brake

To test the air leakage rate, it is essential to turn off the engine and release the service brake. This procedure allows the air pressure in the brake system to stabilize without the influence of the compressor running, enabling an accurate measurement of air loss over time. By turning off the engine, you prevent additional air being added to the system, which would obscure the true leakage rate. Releasing the service brake ensures that any leakage is measured from the point where the brakes are not engaged, giving a clear indication of how well the air system is holding pressure. This method helps to determine whether the air braking system does not have excessive leaks, which is crucial for safety and compliance with regulations. A leakage rate that exceeds the allowable limits can lead to brake failure, which is why this procedure is critical in air brake testing.