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Question

Difficulty: EasyMountain Driving, Steep Grades, and Altitude Hazards

When descending a steep mountain slope, what is the main hazard of continuously applying the foot brakes ('riding the brakes') for an extended distance?

  1. The brakes will overheat and experience brake fade, significantly reducing their stopping ability.Answer
  2. B
    It forces the driver to exceed the basic legal speed limit posted for mountain zones.
  3. C
    It instantly causes a rear tire blowout requiring emergency hard braking.
  4. D
    It changes mandatory regulatory road signs into advisory warning signs.

Answer

Continuous brake application down a steep grade overheats the braking components, causing brake fade and a severe loss of stopping power. Drivers should downshift to a lower gear to use engine braking instead.
Holding down the brake pedal continuously while descending a steep hill generates severe heat friction between the brake pads and rotors. This heat causes 'brake fade,' a dangerous condition where friction drops and the brakes lose their ability to stop the vehicle. To control speed safely, drivers should select a lower gear to utilize engine braking.

Step-by-Step Solution

1
Analyze the mechanical effect of sustained friction on vehicle brakes during a steep mountain descent.
Identify that continuous brake pressure produces intense heat friction within the brake pads and rotors.
Understanding thermal limits in braking systems explains why heavy foot braking is dangerous on long hills.
2
Determine the safety hazard resulting from excessive brake heat.
Recognize that 'brake fade' occurs, reducing friction efficiency and stopping capability.
Overheated brake pads lose their grip against the rotors, leading to potential brake failure.

Key Concept

Brake Fade and Engine Braking on Steep Mountain Grades
Estimated Time:45s
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Topics

Mountain Driving, Steep Grades, and Altitude Hazards

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