The governor controls the air compressor by:

a.Regulating brake pedal pressure

b.Cutting in at 100 PSI and cutting out at 125 PSI

c.Cutting in at 125 PSI and cutting out at 150 PSI

d.Monitoring brake pad wear

Explanation

The governor controls when the air compressor pumps air. It cuts in at around 100 PSI to start building pressure and cuts out at around 125 PSI when the tanks are sufficiently charged.

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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 Class B CDL Air Brakes Test #1 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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