Free CDL Quiz

Compared to hydraulic brakes, air brakes require more stopping distance because of:

a.Heavier vehicle weight only
b.Brake lag distance added by the air system
c.Smaller brake drums
d.Lower friction brake materials

Explanation

Air brakes add brake lag distance that hydraulic brakes do not have. It takes time for air to flow through the lines to the brake chambers, adding about one-half second of delay. Hydraulic systems respond almost instantly because fluid does not compress.

← Back to CDL Air Brakes Test #2

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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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