What is the purpose of the air dryer in an air brake system?

Answer: B — To remove moisture and contaminants from the compressed air

The air dryer in an air brake system serves the essential function of removing moisture and contaminants from the compressed air. When air is compressed, it can carry moisture and other impurities that may lead to corrosion, freezing, and malfunctioning of the brake system components. The air dryer uses a desiccant material to absorb moisture and filtration systems to remove particulates, ensuring that the air supplied to the brake system is clean and dry. This is crucial for maintaining the performance and longevity of the braking system, particularly in varying environmental conditions where humidity can be a significant concern. By keeping the compressed air free from water and debris, the air dryer plays a vital role in ensuring safe and reliable operation of the air brake system.