What is the function of a brake shoe in an air brake system?

The function of a brake shoe in an air brake system is to provide friction against the brake drum. When the driver applies the brakes, air pressure engages the brake shoes, causing them to press against the inner surface of the brake drum. This interaction creates friction, which slows down or stops the vehicle. The effectiveness of the brake system depends significantly on the condition and material of the brake shoes, as they must have adequate grip to ensure safe and efficient braking performance.

In contrast, the roles of releasing air pressure, storing compressed air, or monitoring air pressure are managed by other components within the air brake system, like the air compressor, storage tanks, and various pressure monitoring devices. Understanding the specific function of each part helps ensure proper maintenance and operation of the air brake system.