Why is excessive heat a concern for air brake systems?

Excessive heat is a significant concern for air brake systems primarily because it can lead to brake fade and reduced stopping ability. When brakes are applied repeatedly or for extended periods, especially in situations such as steep descents or heavy traffic, they generate a considerable amount of heat. This heat can cause the brake components, such as the friction materials (brake pads or shoes), to lose their effectiveness, a phenomenon known as brake fade.

During brake fade, the ability of the brakes to create friction diminishes, meaning that even if the driver applies the brakes, the stopping power is significantly reduced. This can create dangerous situations, especially when quick stopping is necessary. Understanding this aspect is crucial for anyone operating vehicles that rely on air brake systems, as managing heat through proper braking techniques can help maintain optimal braking performance and ensure safety on the road.