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ASVAB · Brakes and Suspension

What does ABS (anti-lock braking system) do during hard braking?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

Prevents the wheels from locking up so the driver can keep steering control

  1. A Prevents the wheels from locking up so the driver can keep steering control
  2. B Increases engine power
  3. C Turns off the brakes
  4. D Makes the car stop instantly

Why this is the answer

An anti-lock braking system (ABS) rapidly pulses the brakes to prevent the wheels from locking up during hard or emergency braking. Locked wheels skid and lose steering control; by keeping the wheels rotating, ABS lets the driver continue to steer while braking hard and helps maintain traction, especially on slippery surfaces. ABS does not necessarily shorten stopping distance, but it improves control. The driver should apply firm, steady pressure (not pump the pedal) and may feel the pedal pulsate when ABS activates. Knowing ABS prevents wheel lockup to preserve steering is common brake-system content.
Source: ASVAB Auto Information — Anti-Lock Brakes

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About this topic: Brakes and Suspension

Brakes and suspension questions cover disc versus drum brakes, the hydraulic principle behind the pedal, ABS, and the shocks, struts and springs that keep the tyres on the road. Expect questions on symptoms such as pulling, pulsing or bouncing. This is one of 10 Auto Information questions on brakes and suspension, each with a full explanation on a single study page.

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