THE S6 has a comprehensive set of brakes that features ventilated discs at each corner and an anti-lock braking system with electronic brake-force distribution. The front discs measure 321mm x 30mm, and the rears 269mm x 22mm. Audi claims the "HP2" high-performance brakes, as they're known, offer exceptional fade resistance at the front wheels. Other notable aspects include the use of a tandem booster servo and twin-piston (aluminium) callipers front and rear.