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 a common cause of air brake failure during winter?

Overheating of the system
Freezing of water and compressor oil in the air tanks
Defective air flow valves
Improperly adjusted brake settings

The correct answer is: Freezing of water and compressor oil in the air tanks

The correct answer is related to the issue of freezing of water and compressor oil in the air tanks. During winter, moisture that has accumulated in the air system can freeze when temperatures drop, leading to blockages in the air lines and brake components. This freezing can prevent the air brakes from functioning properly, as the air required to engage the brakes may not be able to flow freely. Ensuring that the air brake system is well-maintained and that moisture is regularly drained from the air tanks is crucial to preventing this issue. Proper winterization techniques, such as using anti-freeze agents in air brake systems, can also help mitigate the risk of freezing. The other options pertain to different issues that could affect an air brake system but are not as directly tied to winter conditions. Overheating, defective valves, and improper brake adjustment can lead to brake failure in various conditions but do not specifically highlight the common winter hazard posed by freezing temperatures and moisture in the system.