What is the slack adjuster used for in an S-cam brake?

a.To adjust the distance between the brake shoes and the drum

b.To connect the air line to the brake chamber

c.To measure air pressure at the wheel

d.To lubricate the brake drum

Explanation

The slack adjuster connects the push rod to the S-cam and is used to adjust the clearance between the brake shoes and the brake drum. Proper adjustment is critical because too much slack means the brakes will not apply fully.

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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.

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