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What is the cause of excessive moisture discharge when draining air reservoirs on a heavy-duty truck air brake system equipped with an air dryer?

Understand the Problem

The question is asking about the cause of excessive moisture discharge when draining air reservoirs in a heavy-duty truck air brake system that is equipped with an air dryer. It includes multiple-choice answers, suggesting it's part of an assessment or test on automotive systems.

Answer

C) Air dryer desiccant saturated with moisture.

The final answer is C) Air dryer desiccant saturated with moisture.

More Information

Excessive moisture in air reservoirs usually indicates the air dryer desiccant is saturated and needs replacing. A properly functioning air dryer should remove moisture from the air before it enters the brake system.