Air Brake Practice Test

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Study for the Air Brake Test. Prepare using flashcards and multiple-choice questions, complete with hints and explanations. Get ready to ace your exam!

Practice this question and more.

When must the air compressor be tested for output pressure?

Before driving the vehicle.
Every time the vehicle is serviced.
Only if the brakes feel different.
Daily before operation.

The correct answer is: Before driving the vehicle.

The air compressor must be tested for output pressure before driving the vehicle to ensure that it is functioning correctly and providing adequate air pressure for the brakes to operate effectively. This pre-trip inspection is crucial for safety because insufficient air pressure can lead to brake failure or other malfunctions while driving. It is part of the mandatory checks a driver should perform to ensure the vehicle is safe for operation, which includes checking not only the air compressor but also the overall air brake system. Daily testing before operation enhances the reliability of the braking system, making it essential to address any potential issues before hitting the road. Ensuring the compressor is up to specification from the very start of the driving day helps in preventing accidents caused by brake failure due to low air pressure. Regular testing during service or based on brake performance can be important, but the immediate checks done prior to driving are critical for immediate safety considerations.