Practice question

An anti-lock braking system (ABS) prevents wheel lock-up by:

  1. Increasing brake fluid pressure continuously
  2. Rapidly modulating (releasing and reapplying) hydraulic pressure when a wheel-speed sensor detects impending lock-up
  3. Disconnecting the brake entirely
  4. Heating the brake fluid

Answer: B — Rapidly modulating (releasing and reapplying) hydraulic pressure when a wheel-speed sensor detects impending lock-up

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