How does brake fade occur in air brake systems?

Brake fade in air brake systems occurs primarily due to overheating, which is a result of prolonged or excessive braking. When the brakes are applied for extended periods or with excessive force, the friction generated between the brake pads and the brake drums or discs leads to an increase in temperature. As the temperature rises, the braking components can lose their effectiveness, which in turn reduces the braking force.

This loss of braking power occurs because the heat can cause the brake fluid to vaporize or diminish the friction material's capability to grip effectively. Consequently, drivers may experience a delay in response or a complete failure in braking performance, which can be dangerous. Addressing brake fade requires proper management of braking techniques, allowing cooling periods between significant brake applications, and ensuring the air braking system is well-maintained to prevent overheating situations.