Michigan Commercial Driver's License (CDL) Practice Exam

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What is one of the consequences of not draining air tanks?

Fuel efficiency may decrease
Battery life may shorten
Brakes may freeze due to accumulated moisture
Tire pressure may be affected

The correct answer is: Brakes may freeze due to accumulated moisture

Draining air tanks is crucial for maintaining the effectiveness of a vehicle's air brake system, and one of the significant consequences of failing to do so is that the brakes may freeze due to accumulated moisture. When air tanks are not drained, moisture can accumulate over time. As temperatures drop, this moisture can freeze, leading to ice formation within the brakes. This ice can restrict the operation of the brake system, potentially creating dangerous conditions that impair the driver's ability to stop the vehicle safely. Maintaining the air brake system by regularly draining the tanks helps prevent moisture buildup and ensures that the braking system operates smoothly and effectively, particularly in cold conditions. This underscores the importance of routine maintenance in commercial vehicle operation, where safety is paramount.