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!

Practice this question and more.

How frequently should air tanks be drained?

Once a week
Every few hours
After each working day
Only before long trips

The correct answer is: After each working day

Draining air tanks regularly is crucial for maintaining the air brake system's effectiveness in vehicles equipped with air brakes. The correct frequency for this procedure is after each working day. This practice is essential because it helps remove moisture and contaminants that accumulate in the tanks. If moisture is allowed to build up, it can freeze in colder conditions, leading to brake system failures. Additionally, contamination can cause wear and damage to the brake components, compromising safety and performance. Understanding the importance of consistent drainage helps ensure the vehicle operates safely and effectively, preventing potential mechanical issues that could arise from neglecting this routine maintenance task. Regularly draining air tanks also extends the lifespan of the air brake system, promoting reliability in day-to-day operations.