What is the function of the air compressor in an air brake system?

a.To store compressed air in the brake drums

b.To pump air into the air storage tanks

c.To release air from the braking system

d.To cool the brake linings

Explanation

The air compressor pumps air into the air storage tanks, building up and maintaining the air pressure needed to operate the air brake system.

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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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