Examkin

Question

Difficulty: MediumStopping and Braking Procedures

A commercial motor vehicle driver operating a vehicle not equipped with antilock brakes needs to stop as quickly as possible on a straight path using the stab braking technique. Which of the following describes the correct procedure for executing this maneuver?

  1. A
    Maintain continuous, firm pedal pressure without releasing, keeping the wheels fully locked until the vehicle stops.
  2. Apply the brakes fully until the wheels lock up, release the pedal until the wheels begin rolling, and reapply full pressure once they are rolling.Answer
  3. C
    Apply the brakes as hard as possible without locking the wheels, keeping the vehicle traveling in a straight line.
  4. D
    Activate the engine retarder to maximum power while applying light, continuous foot pedal pressure to slow down.

Answer

Apply the brakes fully until the wheels lock up, release the pedal until the wheels begin rolling, and reapply full pressure once they are rolling.
Stab braking involves applying the service brakes all the way until the wheels lock, immediately releasing the brake pedal to allow the wheels to start rolling again, and then reapplying the brakes fully once rolling. This cyclic technique restores vehicle steerability and prevents uncontrollable skids during emergency stops in non-ABS vehicles.

Step-by-Step Solution

1
Identify the non-ABS emergency braking technique being requested.
The target maneuver is stab braking.
Stab braking is one of the two primary emergency braking methods recognized by commercial driving standards for vehicles without antilock brakes.
2
Recall the operational cycle of stab braking.
The driver applies the brake pedal all the way down until the wheels lock up, then releases the pedal immediately so the wheels start rolling again, and repeats the application.
Locked wheels cannot steer and slide out of control; releasing the pedal restores wheel rotation and directional stability before braking force is reapplied.
3
Distinguish stab braking from controlled braking and other deceleration methods.
Controlled braking keeps the brakes just under the threshold of locking, whereas stab braking intentionally cycles through lockup and immediate release.
Correctly identifying the lock-release-reapply cycle ensures selection of the accurate technical procedure.

Key Concept

Stab Braking Procedure in Emergency Stopping
Estimated Time:1m 0s
Rate this question

Topics

Stopping and Braking Procedures

More questions from this topic