Arizona Air Brakes CDL Practice Test

What does it indicate if you have to apply more force to the brake pedal on a downhill slope?

1. A. The brakes are worn out.

2. B. The brakes are fading.

3. C. The brake fluid is low.

4. D. The brake system is functioning normally.

The correct answer is: B. The brakes are fading.

If you find that you have to apply more force to the brake pedal while navigating a downhill slope, it often indicates that the brakes are fading. This phenomenon occurs when brakes are subjected to prolonged or excessive use, particularly on declines, which can lead to overheating. Overheating diminishes the braking capacity, requiring the driver to apply greater pressure to achieve the same stopping power. Brake fading is a critical issue because it directly affects the vehicle's stopping ability, potentially leading to dangerous situations if not addressed promptly. Thus, recognizing the signs of fading brakes, such as the need for increased pedal force, is crucial for safe driving, especially in hilly or mountainous terrain where braking is heavily relied upon. While worn-out brakes, low brake fluid, or a normally functioning system could also play roles in brake performance, they do not specifically relate to the context of requiring more force on a downhill slope as clearly as fading brakes do.