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Difficulty: Very hardStopping and Braking Procedures

To successfully execute the stab braking technique during an emergency stop in a commercial motor vehicle lacking an anti-lock braking system (ABS), the operator must fully apply the brakes until lock-up occurs, release the pedal, and then reapply maximum pressure immediately before the wheels resume rolling to minimize stopping distance.

Answer: Answer

Answer

The statement is false.
The correct answer is false because a critical requirement of stab braking is allowing the wheels to start rolling again after lock-up. Reapplying the brakes before the wheels roll prevents the recovery of steering control.

Step-by-Step Solution

1
Identify the core components of the stab braking procedure for non-ABS vehicles.
Stab braking involves applying the brakes fully, releasing them when the wheels lock, and then reapplying them.
Establishing the baseline procedure is necessary to evaluate the specific timing constraint mentioned in the statement.
2
Analyze the specific timing constraint claimed in the statement.
The statement claims that brake pressure should be reapplied 'immediately before the wheels resume rolling.'
Isolating the specific procedural timing is required to determine the factual accuracy of the claim.
3
Compare the statement's timing requirement with FMCSA/CDL safety standards.
CDL guidelines strictly mandate that the driver must wait until the wheels are rolling again to regain steering control prior to reapplying the brakes.
Confirming against the official manual proves the statement provides dangerous and incorrect advice, making it false.

Key Concept

Emergency Braking Techniques (Stab Braking Timing)
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Topics

Stopping and Braking Procedures

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