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Electronic anti-lock braking- Disc brake Brakepedal Brakemastercylinder Toothed disc Connected to thewheel hub androtates at the samespeed as the roadwheel.. Speed sensor Detects the speedat which thetoothed discrotates. Hydraulic control unit Receives messages fromthe electronic control unitthat a wheel is about to lockup and reduces hydraulicpressure accordingly. Electronic control unit Fed with information from thespeed sensor, it decideswhether a wheel is about tolock up.

Virtually all modern cars are fitted with microprocessor-controlled anti-lock braking systems (ABS). These can react very quickly to the wheels locking, interrupting and reapplying the brakes up to 25 times a second to ensure the vehicle doesn't skid.

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