Question

Difficulty: EasyStopping and Braking Procedures

A commercial motor vehicle driver must perform a controlled stop to avoid a hazard ahead while maintaining full steering control. What is the correct chronological sequence of steps for executing the controlled braking procedure?

  1. 1Apply the brakes as hard as possible without locking the wheels.
  2. 2Keep steering adjustments minimal to maintain vehicle alignment in the lane.
  3. 3Release the brake pedal immediately if the wheels lock and begin to skid.
  4. 4Reapply the brakes firmly as soon as the wheels start rolling again.

Answer

The correct sequence for controlled braking is: apply the brakes as hard as possible without locking the wheels, keep steering adjustments minimal to maintain vehicle alignment, release the brake pedal immediately if the wheels lock, and reapply the brakes firmly as soon as the wheels start rolling again.
Controlled braking requires applying the service brakes as hard as possible without causing wheel lockup, keeping steering movements minimal, immediately releasing the brakes if the wheels begin to slide to regain steering control, and reapplying brake pressure once the wheels are rolling freely.

Step-by-Step Solution

1
Apply initial firm braking force
Deceleration begins at the threshold of wheel lockup.
Controlled braking relies on maximum braking pressure without inducing a skid.
2
Maintain straight-line steering
The vehicle stays balanced and aligned in its path of travel.
Large steering inputs while under heavy braking can induce a jackknife or side skid.
3
Release brake pedal if lockup occurs
Tires regain rotational grip on the roadway surface.
Locked wheels eliminate directional steering control.
4
Reapply firm brake pedal pressure once rolling
Vehicle completes the stop in a stable, controlled manner.
Deceleration resumes only after rolling traction is restored.

Key Concept

Controlled braking procedure and skid recovery sequence
Estimated Time:45s
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