Illinois CDL Practice Exam 2026 - Free CDL Practice Questions and Study Guide

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What is the purpose of engine braking on a downhill slope?

To increase speed on the descent

To prevent overheating of the brakes

The purpose of engine braking on a downhill slope is primarily to prevent overheating of the brakes. When descending a hill, relying solely on the brake system can lead to excessive heat buildup, which may reduce braking effectiveness and increase the risk of brake failure. Engine braking uses the vehicle's engine to help slow the vehicle down by downshifting to a lower gear, which increases engine resistance. This method allows for a more controlled descent, using the engine's compression to assist in managing speed, ultimately reducing the strain on the braking system. This approach helps maintain brake performance throughout the descent and enhances overall safety.

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To maintain a consistent speed

To allow the driver to relax

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