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

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

The function of an air dryer in an air brake system is to remove moisture and impurities from the compressed air. Moisture in the air system can lead to several issues, such as freezing in cold conditions, which may cause brake failure or reduced efficiency. The air dryer utilizes filters and desiccant materials to trap water vapor and contaminants, ensuring that the air delivered to the brake components is clean and dry. This is crucial for the reliable function of the air brakes, as any contaminants or moisture can lead to corrosion, wear, and potential malfunction of the brake system. Overall, the presence of a properly functioning air dryer helps maintain the integrity and reliability of the braking system.