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Question

Difficulty: HardBrake Failure Management

While descending a steep highway grade, your foot brake pedal suddenly sinks completely to the floor without slowing the vehicle. Arrange the following emergency actions in the correct step-by-step sequence recommended by DMV safety standards to safely bring the vehicle to a complete stop.

  1. 1Pump the brake pedal rapidly multiple times.
  2. 2Shift the transmission into a lower gear.
  3. 3Gently apply the parking brake while holding the brake release lever or button.
  4. 4Steer into an emergency runaway truck ramp or onto a safe open shoulder.

Answer

The proper sequence for managing total brake failure on a downhill grade is: 1) Pump the brake pedal rapidly, 2) Shift into a lower gear, 3) Gently apply the parking brake while holding the release mechanism, and 4) Steer onto an emergency runaway ramp or safe shoulder.
The established protocol begins with pumping the brake pedal rapidly to rebuild hydraulic pressure. If speed remains unchanged, downshifting harnesses engine braking to reduce vehicle velocity. Next, the parking brake is applied gradually while maintaining pressure on the release latch to avoid locking the rear wheels. Lastly, the driver directs the vehicle onto an emergency ramp or safe shoulder off the main road.

Step-by-Step Solution

1
Pump the brake pedal fast and hard.
Attempts to compress remaining hydraulic fluid in the system.
If hydraulic pressure has only partially leaked, pumping may restore sufficient pedal effort to slow down.
2
Downshift to lower gear ratios sequentially.
Engages engine braking to slow vehicle momentum.
Lower gears force the engine to turn faster relative to wheel speed, naturally dragging down speed without relying on friction brakes.
3
Apply the parking brake gradually while continuously controlling the release button.
Applies mechanical friction directly to the rear wheels without lockup.
Abrupt parking brake application at high speeds will lock the rear wheels, sending the vehicle into an uncontrollable spin.
4
Guide the vehicle completely out of moving traffic toward an escape ramp or clear roadside area.
Brings the vehicle to a final stop off the roadway.
Ensures the vehicle stops safely without creating an obstacle or collision risk for other drivers.

Key Concept

Sequential emergency procedures for total service brake failure.
Estimated Time:2m 0s
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Topics

Brake Failure Management

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