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Difficulty: EasySpeed on Curves and Downgrades

Maintaining constant, light pressure on the service brakes while descending a long downgrade helps dissipate friction heat and protects against brake fade.

Answer: Answer

Answer

False
The statement is false because continuous light braking generates steady, compounding friction heat with no cooling phase. Proper downgrade speed control relies on selecting the correct low gear and using intermittent snub braking to allow the brakes to cool between applications.

Step-by-Step Solution

1
Analyze the mechanical effect of continuous brake application during a downgrade descent.
Constant contact between brake linings and drums generates continuous thermal energy with no opportunity for cooling airflow.
Brake components depend on release intervals to shed heat into the surrounding air.
2
Evaluate the risk of thermal buildup on vehicle braking effectiveness.
Extreme temperatures cause brake fade, expanding brake drums and glazing linings so that friction is significantly reduced.
Safe downgrade operation requires low gear selection and engine braking supplemented only by intermittent snub braking.

Key Concept

Prevention of thermal brake fade on downgrades
Estimated Time:45s
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Topics

Speed on Curves and Downgrades

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