Description & Operation

All models have self-adjusting front and rear disc brakes. Cable actuated parking brake mechanically activates the rear calipers.

Hydraulic system uses a tandem master cylinder with vacuum assist. Hydraulic system is diagonally split, left front and right rear wheels form one circuit and right front and left rear wheels form the other circuit. The brake pressure regulator has been deleted, as it's function has been replaced by ABS control module programming.

Depending on model year, A8 and S8 can be equipped with one of three different front brake assemblies. These different assemblies are:

• ATE FN3 Single Piston Caliper
• HP-2 Dual-Piston Caliper (Steel or Aluminum Body)
• Brembo 4-Piston Caliper