Commercial Driver License (CDL) Class B Practice Test

What can lead to brake fade or failure?

1. Overuse of brakes that generates excessive heat

2. Regular maintenance and inspections

3. Keeping brakes adjusted appropriately

4. Using anti-lock brakes properly

The correct answer is: Overuse of brakes that generates excessive heat

The correct answer identifies overuse of brakes that generates excessive heat as a primary cause of brake fade or failure. When brakes are applied continuously or excessively, they experience friction, which generates heat. As the temperature of the brake components rises, the effectiveness of the brakes can diminish. This phenomenon, known as brake fade, occurs when the brake pads or shoes become too hot to function properly, resulting in a significant loss of braking power. If the brakes overheat, they may no longer grip the brake drum or rotor effectively, leading to potentially dangerous situations where the driver may be unable to stop the vehicle as needed. In contrast, regular maintenance and inspections, keeping brakes adjusted appropriately, and using anti-lock brakes properly are all practices aimed at preventing brake failure. These behaviors contribute positively to vehicle safety and performance. Regular maintenance helps to identify and rectify issues before they escalate, while proper adjustment ensures that the braking system operates within its intended parameters. Anti-lock brakes are designed to prevent wheel lock-up during emergency stops, enhancing the driver’s ability to maintain control. Therefore, while these practices are essential for safe vehicle operation, they do not lead to brake fade or failure.