What do air brake gauges tell you?

a.The temperature of the brake drums

b.How much air pressure is in the air tanks

c.The thickness of the brake pads

d.How fast the vehicle is going

Explanation

Air brake gauges on the dashboard indicate the amount of air pressure in the air tanks, measured in PSI. In dual air brake systems, there are gauges for each system (primary and secondary). Monitoring these gauges is critical for safe operation.

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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 #2 section. Practice with more questions from this category to build confidence before taking the official DMV test.

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