Michigan Commercial Driver's License (CDL) Practice Exam

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How often should you drain the air tanks of your commercial vehicle?

Every 2 hours of driving
Once per shift
At the end of each day
Before every refueling

The correct answer is: At the end of each day

Draining the air tanks of your commercial vehicle at the end of each day is crucial for maintaining the proper function of the air brake system. Over time, moisture from the air can accumulate in the air tanks. If this moisture is not regularly removed, it can lead to corrosion of the tanks, freeze in cold weather, and cause brake failure or reduced brake effectiveness. By draining the tanks daily, you ensure that any accumulated moisture is removed, which helps to preserve the integrity of the air brake system and enhances overall safety while operating the vehicle. Regular maintenance practices, such as this, are essential for preventing mechanical problems and ensuring that the vehicle remains in safe operating condition.