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Question

Difficulty: MediumStopping and Braking Procedures

A commercial motor vehicle driver operating a vehicle without an antilock braking system (ABS) must execute an emergency stop while maintaining steering control. Which procedure correctly describes the controlled braking technique?

  1. A
    Apply the brakes fully to lock the wheels, immediately release pedal pressure when the vehicle skids, and reapply full pressure once the wheels resume rolling.
  2. B
    Engage the auxiliary retarder to its highest setting and apply light, continuous service brake pressure to prevent overheating the brake drums.
  3. Apply the brakes as hard as possible without locking the wheels, keeping steering adjustments minimal and releasing the brakes only if the wheels lock or large steering corrections are required.Answer
  4. D
    Pump the brake pedal rapidly with light pressure while depressing the clutch pedal to the floor to disconnect engine torque.

Answer

Applying the brakes as hard as possible without locking the wheels, making only minor steering adjustments, and releasing the brakes only if wheel lockup occurs or large steering corrections are needed.
Controlled braking requires applying the service brakes as hard as possible without causing the wheels to lock up. Keeping the wheels rolling maintains traction and allows the driver to make minor steering corrections to keep the vehicle in a straight path. If the wheels lock or large steering adjustments become necessary, the driver briefly releases and reapplies the brakes.

Step-by-Step Solution

1
Identify the primary operational objective of controlled braking during an emergency stop.
Recognize that the technique aims to maximize braking force while keeping the wheels rolling.
Rolling wheels maintain traction with the road surface, allowing the driver to steer the vehicle.
2
Differentiate controlled braking from stab braking and auxiliary retardation.
Eliminate methods that intentionally induce wheel lockup cycles or rely on powertrain retarders.
Locked wheels eliminate directional steering, and retarders are meant for speed maintenance rather than emergency stops.
3
Select the option that correctly details threshold brake application and steering management.
The correct technique applies firm pressure short of lockup with minimal steering inputs.
This procedure achieves the shortest possible stopping distance while preserving vehicle control.

Key Concept

Controlled braking execution and maintaining steering control during emergency stops
Estimated Time:1m 0s
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Topics

Stopping and Braking Procedures

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