What is the main function of the drier in an air brake system?

The main function of the drier in an air brake system is to remove moisture from the compressed air. Moisture in the air system can lead to various issues, including freezing in cold temperatures, which can cause brake failure or reduced efficiency. The drier typically contains a desiccant material that absorbs this moisture, keeping the air dry and ensuring that the components of the air brake system operate smoothly. By removing moisture, the drier plays a crucial role in extending the lifespan of the brake system and maintaining its reliability.

Other aspects, such as providing lubrication or controlling temperature, are not the primary roles of the drier. While storage of compressed air is a function associated with other components in the brake system, the drier specifically focuses on moisture control, making it essential for the proper functioning of air brakes.