Michigan CDL - Air Brakes Practice Exam

Using alcohol evaporators or dehumidifiers in the air system is crucial for preventing freeze-ups in the air brake system. In cold weather, moisture in the compressed air can freeze and create blockages in the system. When water vapor condenses within the air system, it can lead to ice formation, especially in the moisture separator or valves. Alcohol evaporators introduce a chemical that helps lower the freezing point of water, effectively reducing the risk of ice forming within the air lines or components. This helps maintain smooth operation of the air brakes, ensuring that they function properly even in low temperatures.

Preventing moisture buildup is essential for the overall reliability of the air brake system, particularly in winter conditions. While other options may address different aspects of brake system maintenance, they do not directly address the specific issue of moisture and freezing that can compromise air brake performance.