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Electronic anti-lock braking

Electronic anti-lock braking Disc brake Brake pedal Brake master cylinder Toothed disc Connected to the wheel hub and rotates at the same speed as the road wheel.. Speed sensor Detects the speed at which the toothed disc rotates. Hydraulic control unit Receives messages from the electronic control unit that a wheel is about to lock up and reduces hydraulic pressure accordingly. Electronic control unit Fed with information from the speed sensor, it decides whether a wheel is about to lock 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.