The governor should cut out the air compressor at approximately 120 to 140 psi. This prevents over-pressurization of the air brake system. If the compressor does not cut out in this range, the system needs repair.
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 Class A CDL Knowledge Test #2 section. Practice with more questions from this category to build confidence before taking the official DMV test.
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