Free CDL Quiz

If the safety valve has to release air, what is the likely problem?

a.The drain valves are stuck open
b.The governor or compressor unloading mechanism is malfunctioning
c.The brake pedal is stuck
d.The slack adjusters are too tight

Explanation

If the safety valve releases air, it means pressure has exceeded 150 PSI. This likely indicates a malfunctioning governor that is not cutting out the compressor at 125 PSI, or the compressor unloading mechanism has failed.

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About the CDL Exam

The CDL (Commercial Driver License) exam tests your knowledge of commercial driving rules, safety procedures, and vehicle operation. You must score 80% or higher to pass the written knowledge test. The exam covers general knowledge, air brakes, combination vehicles, and various endorsements.

This question is from the CDL Air Brakes Test #2 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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