The anti-lock braking system (ABS) prevents the wheels from locking up during braking. Even under strong braking, the driver can better control and steer the car, potentially avoiding obstacles without having to release the brakes first. When the ABS is activated, the driver will notice a slight pulsation of the brake pedal. The anti-lock brake system is optimized with electronic brake-force distribution (EBD), and is standard on all Audi models.
A note on ABS: when driving on certain surfaces like gravel or snow on a hard road surface, ABS may result in longer stopping distances.