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Question

Difficulty: MediumBraking Systems and ABS

You are driving a car fitted with an anti-lock braking system (ABS). How should you apply the footbrake during an emergency stop?

  1. A
    Pump the brake pedal rapidly and repeatedly until the vehicle stops safely
  2. Apply the brake pedal firmly and rapidly, keeping full pressure on it until the vehicle has stoppedAnswer
  3. C
    Press the brake pedal firmly, but release the pressure as soon as the pedal begins to vibrate
  4. D
    Apply gentle pressure to the footbrake while pulling up the parking brake to shorten the stopping distance

Answer

Apply the brake pedal firmly and rapidly, keeping full pressure on it until the vehicle has stopped
When performing an emergency stop in a vehicle fitted with an anti-lock braking system (ABS), you should apply prompt, firm, and continuous pressure to the footbrake pedal until the vehicle stops. ABS automatically senses when a wheel is about to lock and rapidly modulates brake pressure to prevent skidding, allowing you to maintain steering control throughout the manoeuvre.

Step-by-Step Solution

1
Identify the vehicle braking specification and driving scenario
The vehicle is equipped with an anti-lock braking system (ABS) and must perform an emergency stop
Different braking systems require specific driver techniques to achieve maximum deceleration while maintaining control
2
Determine the correct driver input for an ABS-equipped vehicle
Press the footbrake pedal rapidly and hard, holding continuous pressure until the vehicle comes to a complete halt
ABS automatically monitors wheel rotation and pulses hydraulic pressure to prevent wheel lockup, allowing the driver to steer while braking
3
Recognise common misconceptions regarding ABS operation
Avoid pumping the brake pedal, releasing pressure during pedal vibration, or applying the parking brake
Driver cadence braking interferes with computer-controlled modulation, releasing during pulsation reduces braking force, and applying the parking brake can induce a rear-wheel skid

Key Concept

Correct emergency braking technique with an anti-lock braking system (ABS)
Estimated Time:45s
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Topics

Braking Systems and ABS

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