Examkin

Question

Difficulty: MediumMountain Driving and Steep Downgrades

Applying continuous, light pressure to the service brakes throughout a steep mountain downgrade generates less thermal buildup than snub braking because the friction force is distributed evenly over time.

Answer: Answer

Answer

False
The statement is false because continuous light braking is a primary cause of brake fade on steep grades. Continuous contact traps heat in the friction surfaces, whereas snub braking allows drums to cool during the release intervals.

Step-by-Step Solution

1
Analyze the thermal dynamics of commercial motor vehicle drum brakes during prolonged steep downgrades.
Continuous friction contact constantly transfers heat into brake drums and linings without an unweighted cooling interval.
Brake components require intermittent release phases to transfer heat away to the surrounding air and prevent reaching critical fade temperatures.
2
Evaluate the standard CDL snub braking method compared to continuous light braking.
Snub braking applies firm, steady pressure to reduce speed to 5 mph5\text{ mph} below the safe speed, followed by a complete release of the service brakes.
The release cycle permits airflow to cool the drums, preventing drum expansion, lining glazing, and catastrophic loss of stopping capability.

Key Concept

Brake Fade and Proper Snub Braking Technique on Mountain Downgrades
Estimated Time:1m 0s
Rate this question

Topics

Mountain Driving and Steep Downgrades

More questions from this topic