What should not be present on the brake drum during an inspection?

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Prepare for the CDL Pre-trip Inspection Exam with our quiz. Utilize flashcards and multiple choice questions, with each question offering hints and explanations. Get set for your test day!

During a pre-trip inspection of the brake system, it is crucial to ensure that the brake drum is free from oil or grease. The presence of oil or grease on the brake drum can lead to reduced friction, which is essential for the brakes to function effectively. This can result in longer stopping distances or even brake failure, jeopardizing safety on the road.

Dust is often present as part of normal wear and tear but does not typically indicate an immediate problem. Small scratches may occur over time due to normal operation and may not affect the overall functionality of the brake system unless they are deep enough to impact performance. Similarly, rust can form on brake components but often does not pose a significant issue unless it is excessive or leads to structural integrity problems. Overall, the key concern during a brake drum inspection is to ensure that it is free from any substances that would impede braking performance, particularly oil or grease.

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