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Question

Difficulty: EasySkid Control and Recovery

When a commercial vehicle experiences a drive-wheel skid caused by over-braking on a slick roadway, what should the driver do first to regain control?

  1. A
    Activate the auxiliary engine retarder to help slow the drive axle.
  2. B
    Steer firmly in the opposite direction of the rear-wheel slide.
  3. Stop braking to allow the rear drive wheels to roll and regain traction.Answer
  4. D
    Apply maximum pressure to the brake pedal until the vehicle stops completely.

Answer

Stop braking to allow the rear drive wheels to roll and regain traction.
In a drive-wheel braking skid, the rear tires lose grip because excessive braking force has locked them up. Releasing the service brakes immediately allows the wheels to turn freely again, which restores tire grip and allows the driver to steer the vehicle along its intended path.

Step-by-Step Solution

1
Identify the cause of the drive-wheel skid.
Excessive service brake application has locked the rear tires on a slick surface.
Locked wheels lose directional stability and slide sideways across the road surface.
2
Take your foot completely off the brake pedal.
The rear wheels unlock and start rolling again.
Rolling wheels produce the necessary traction to follow the path of travel and respond to steering inputs.

Key Concept

Drive-wheel braking skid recovery fundamentals
Estimated Time:45s
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Topics

Skid Control and Recovery

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