Arizona Air Brakes CDL Practice Test

Brake shoes can reach temperatures of 500°F or more during heavy braking due to the friction generated when brakes are applied. As the vehicle slows or stops, the brake shoes press against the brake drum, generating significant heat. This high level of heat can occur especially during situations such as emergency stops or prolonged braking, where the vehicle is descending a hill or trying to slow down from high speeds. It's important to monitor brake temperatures because excessive heat can lead to brake fade, which diminishes the braking ability and can be dangerous. Factors like the weight of the vehicle, the type of braking system, and driving conditions can influence the heat generated in the brake shoes. Understanding this aspect of brake function is crucial for ensuring vehicle safety and effective braking performance.