Anti-lock braking system (ABS) prevents the wheels from locking during heavy braking. This reduces the braking distance, especially in case of poor road grip in rain or snow. The grip force between the wheels and the road in this case is greater when the wheels continue to rotate during braking. In addition, even with full braking, the car remains steerable.
1 - brake master cylinder, brake booster, brake fluid reservoir
2 - speed sensor
3 - electronic control unit
4 - hydraulic unit
ABS works at speeds above 5-7 km/h. The regulation of all braking processes in the blocking range begins after a speed of 12 km / h has been reached.
Based on the signals from the speed sensors, installed two on the front and rear wheels, the electronic control unit calculates the average speed, approximately corresponding to the speed of the car. By comparing the rotational speed of each individual wheel with the average calculated speed, the electronic unit recognizes the slip state of the individual wheel and thereby determines which wheel is in the pre-lock state.
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