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ABS

When the driver brakes hard on a slippery road surface, the anti-lock braking system prevents the wheels from locking, so that the vehicle can still be steered.
When the wheels lock up, they are no longer able to transmit cornering forces, meaning that the driver loses control of the vehicle. To prevent this from happening, the ABS control unit uses wheel speed sensors to monitor the rotational speed of each wheel. If it detects that a wheel is about to lock, a solenoid valve in the anti-lock braking system’s control unit reduces the brake pressure applied at the wheel in question until it starts to rotate freely again. The pressure is subsequently increased to the lock-up threshold once more. The vehicle remains stable and steerable.
This process is repeated several times per second in all Volkswagen models. The driver can tell when the anti-lock braking system is in action by a slight juddering of the brake pedal. Within the anti-lock braking system’s operating range, the vehicle can be steered with ease even while full braking power is being applied. This helps the driver to avoid obstacles or a collision with other vehicles.

A note regarding ABS: on certain surfaces, such as gravel or firm ground covered by snow, the standard ABS system may have the effect of increasing the braking distance.