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Question

Difficulty: EasyStopping and Braking Procedures

When an unexpected obstacle requires rapid deceleration, a commercial driver chooses to use the controlled braking technique. Which of the following describes the correct procedure for this maneuver?

  1. A
    Locking the wheels completely with maximum pedal pressure and steering firmly to slide to a halt
  2. Applying the brakes as hard as possible without locking the wheels while maintaining directional controlAnswer
  3. C
    Engaging the engine retarder at full capacity on slick pavement instead of using the service brakes
  4. D
    Depressing the clutch pedal immediately and pumping the brake pedal rapidly to reduce brake lag

Answer

Applying the brakes as hard as possible without locking the wheels while maintaining directional control
Controlled braking is executed by applying the service brakes as hard as possible without locking the wheels, keeping the steering wheel steady to stop the vehicle in a straight path while preserving steering capability.

Step-by-Step Solution

1
Identify the primary goal of emergency controlled braking
Recognize that the vehicle must stop as quickly as possible without losing steering ability
Steering control requires rolling traction; locked wheels cannot provide directional control
2
Determine the proper foot brake application pressure
Apply firm, steady pressure up to the threshold of wheel lockup
Threshold braking delivers maximum friction while keeping the tires rotating
3
Manage steering and make necessary adjustments
Keep the vehicle in a straight line, releasing the brake briefly only if wheels lock or large steering corrections are needed
Ensures vehicle stability throughout the stopping distance

Key Concept

Controlled Braking Technique
Estimated Time:45s
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Topics

Stopping and Braking Procedures

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