Commercial Driver License (CDL) Class B Practice Test

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Study for the Commercial Driver License (CDL) Class B Test. Study using multiple-choice questions, hints, and explanations. Prepare for your exam effectively!

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What is the purpose of slack adjusters in a braking system?

To control the air pressure in the tanks
To determine the force required to engage the brakes
To prevent brake fade
To monitor tire pressure

The correct answer is: To determine the force required to engage the brakes

Slack adjusters play a crucial role in the braking system of heavy vehicles by regulating the force needed for brake engagement. They serve to maintain the proper amount of slack in the brake linkage, ensuring that the brakes activate effectively when needed. Over time, as brake shoes wear down, the slack adjusters automatically compensate for this wear, adjusting the linkage to keep the braking system responsive. This automatic adjustment is vital because it helps maintain the correct brake application force. If the slack adjusters fail to perform this function correctly, it can lead to insufficient braking force, longer stopping distances, and increased wear on the braking components. Therefore, the primary purpose of slack adjusters is to ensure that drivers experience consistent and effective braking throughout the life of the brake system.