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Question

Difficulty: EasyStopping and Braking Procedures

A commercial driver needs to bring the vehicle to a rapid stop while maintaining directional steering control on a dry, straight roadway. Which of the following procedures describes the correct method of controlled braking?

  1. A
    Rely primarily on the engine brake retarder at maximum setting without touching the service brake pedal.
  2. Apply firm brake pedal pressure up to the point just before wheel lockup, keeping steering adjustments minimal.Answer
  3. C
    Apply full braking force until all wheels lock, holding the brakes locked until the vehicle comes to a full stop.
  4. D
    Pump the brake pedal rapidly to full pressure and steer sharply back and forth to scrub off speed.

Answer

Apply firm brake pedal pressure up to the point just before wheel lockup, keeping steering adjustments minimal.
Controlled braking is defined in commercial driving as applying the brakes as hard as possible without locking the wheels, allowing the vehicle to stop smoothly in a straight line while retaining full steering control.

Step-by-Step Solution

1
Identify the primary objective of controlled braking
Recognize that the technique requires stopping in the shortest possible distance without locking the wheels or losing steering control.
When commercial vehicle wheels lock, rolling traction is lost and directional steering control becomes impossible.
2
Evaluate proper brake pedal application and steering technique
Apply continuous, heavy pressure just short of wheel lockup and make only small steering inputs.
Keeping the wheels rolling allows the driver to keep the vehicle tracking straight in its lane while maximizing braking friction.

Key Concept

Controlled Braking Procedure
Estimated Time:45s
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Topics

Stopping and Braking Procedures

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