Manitoba Airbrake Practice Exam

What is "brake fade" primarily caused by?

1. Damaged brake pads

2. Overheating due to prolonged or hard braking

3. Low air pressure in the system

4. Inadequate brake fluid

The correct answer is: Overheating due to prolonged or hard braking

Brake fade is primarily caused by overheating that occurs during prolonged or hard braking. When the brakes are used heavily and repeatedly, especially in situations like descending steep hills or during rapid stops, the braking components generate a lot of heat. This heat can cause the brake pads and rotors to reach temperatures that significantly diminish their effectiveness. As the temperature rises, the adhesion between the brake pads and the rotors can weaken, leading to a reduction in friction. This loss of friction is what results in the sensation of brake fade, where drivers find that their vehicle does not stop as effectively as it should. The brake system can lose its responsiveness, and the vehicle may require a longer distance to come to a complete stop. While damaged brake pads, low air pressure, and inadequate brake fluid are issues that can affect brake performance, they do not contribute to the specific condition known as brake fade as directly as overheating does. Understanding the mechanics of brake fade is essential for drivers, as it highlights the importance of maintaining proper braking techniques and ensuring that brake systems remain in good working condition under demanding circumstances.