New Jersey Air Brakes Practice Test

What can excessive heat from brake usage cause?

1. Brakes to overheat

2. Brake fade or failure

3. Brake alignment issues

4. No effect

The correct answer is: Brake fade or failure

Excessive heat from brake usage primarily leads to brake fade or failure. When brakes are applied frequently or vigorously, they generate heat due to friction between the brake pads and rotors. This heat can build up to a point where the brake components start to lose their effectiveness. As temperatures rise, the materials within the braking system can begin to break down or change properties. For instance, brake fluid can become vaporized due to high temperatures, creating vapor pockets that reduce hydraulic pressure and, consequently, the force applied to the brakes. This phenomenon is known as brake fade, where the brakes become less responsive, making it difficult for the driver to slow down or stop effectively. In some situations, extreme overheating can lead to complete brake failure, where the brakes cease to function entirely. Thus, understanding the effects of excessive heat is crucial for maintaining a safe and effective braking system in any vehicle.