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Difficulty: MediumStopping and Braking Procedures

In an emergency stopping scenario, an Antilock Braking System (ABS) requires the commercial motor vehicle driver to repeatedly pump the brake pedal to prevent wheel lockup.

Answer: Answer

Answer

False - Drivers operating ABS-equipped commercial motor vehicles should apply steady, continuous brake pressure during an emergency stop, as manual pumping interferes with the electronic modulation and lengthens stopping distance.
Selecting False is correct because an Antilock Braking System (ABS) automatically detects wheel lockup and pulses brake pressure many times per second. In an emergency stop, the driver should apply steady, continuous pressure to the service brake pedal. Manually pumping the pedal interrupts the electronic control cycle and increases the total stopping distance.

Step-by-Step Solution

1
Identify the vehicle configuration and braking scenario described in the statement.
The scenario specifies an emergency stop in a commercial motor vehicle equipped with an Antilock Braking System (ABS).
Braking procedures differ significantly between vehicles with ABS and older vehicles utilizing non-ABS pneumatic systems.
2
Evaluate the standard operating procedure for emergency stops using ABS.
The driver must apply firm, uninterrupted brake pressure and allow the ABS sensors and valves to electronically manage wheel slippage.
Manually pumping the service brake pedal turns the ABS controller on and off, defeating the computer's high-speed modulation cycle.
3
Determine the accuracy of the statement based on commercial driver safety regulations.
The statement is False.
FMCSA guidelines instruct drivers never to pump the brake pedal on an ABS-equipped vehicle during emergency stops.

Key Concept

ABS emergency stopping procedure and pedal pressure management
Estimated Time:1m 0s
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Topics

Stopping and Braking Procedures

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