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Difficulty: MediumMountain Driving and Steep Downgrades

When descending a steep mountain downgrade, applying light and continuous pressure to the service brakes generates less cumulative heat and is safer than using intermittent snub braking.

Answer: Answer

Answer

False
Continuous light brake application prevents the brake linings and drums from cooling between applications, resulting in excessive heat buildup and severe brake fade. The standard CDL procedure requires selecting the proper low gear and utilizing intermittent snub braking.

Step-by-Step Solution

1
Analyze the thermal impact of continuous friction versus intermittent brake application during downgrade descent.
Continuous dragging of the service brakes prevents airflow from dissipating heat away from the foundation brake components.
Commercial vehicle foundation brakes require off-cycles to cool and prevent heat accumulation in the brake drums and friction linings.
2
Evaluate the procedural standard defined in the CDL manual for descending steep downgrades.
The driver must select the appropriate low gear and use snub braking (applying firm pressure to slow 5 mph below safe speed and releasing) rather than continuous dragging.
Snub braking minimizes overall heat buildup and preserves braking power in the event of an emergency stop.

Key Concept

Brake Fade and Snub Braking on Mountain Downgrades
Estimated Time:1m 0s
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Topics

Mountain Driving and Steep Downgrades

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