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Question

Difficulty: EasyMountain Driving and Steep Grades

Arrange the following steps in the correct order for safely preparing for and navigating a descent down a steep mountain grade.

  1. 1Reduce vehicle speed before reaching the beginning of the steep downhill grade.
  2. 2Shift into a lower gear before starting down the incline.
  3. 3Rely primarily on engine braking to hold a steady, safe downhill speed.
  4. 4Apply foot brakes lightly and periodically only when speed starts to exceed safe limits.

Answer

The correct order begins with slowing down before the descent, downshifting into a lower gear prior to going downhill, relying on engine braking during the descent, and using intermittent light foot braking only when necessary.
The proper mountain descent procedure requires slowing down and downshifting into a lower gear before reaching the slope. Once on the grade, engine braking should serve as the primary speed control, with light, periodic foot braking applied only to keep speed within safe limits.

Step-by-Step Solution

1
Slow down before reaching the incline
Establishes a safe entry speed prior to gravitational force pulling the vehicle downward.
It is much easier to maintain a slow speed down a grade than to slow down once already descending.
2
Select a lower gear before starting downhill
Engages engine compression braking.
Shifting into lower gear before the slope prevents momentum from making gear shifting difficult or impossible midway down.
3
Allow engine braking to control descent speed
Keeps speed regulated automatically without wearing out friction brakes.
Engine braking provides continuous resistance without generating brake pad friction heat.
4
Use light, brief foot braking only as needed
Supplements engine braking while giving brake pads time to cool down between taps.
Continuous foot braking causes brake overheating (thermal fade), leading to complete loss of stopping ability.

Key Concept

Engine braking and gear management for mountain grade descent
Estimated Time:45s
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Topics

Mountain Driving and Steep Grades

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