Girodisc 2 Piece Front Rotors for Brembo 18z Calipers
These are lightweight two piece rotors that are made specifically to be used on the B5 S4, B6/B7 S4/A4 or C5 A6/Allroad with the OEM "18Z" Brembo 6 piston caliper found on the Porsche Cayenne, Audi Q7, and VW Touareg. The only modification required is some minor clearancing on the bottom of the upright. We provide instructions and a video on how to do this. Other than that the discs will bolt directly to the car and work with the "18Z" calipers perfectly. The Girodisc front rotors weight 19.5lbs which are lighter than the stock units. This reduction in rotational and unsprung weight allows for quicker acceleration and suspension response.
The central hat section of the disc is made from 6061-T6 aircraft specification aluminum. The disc is made from cast iron to the same specification and material as used by professional racing organizations. It is a curved vane design, developed in racing to act as a centrifugal pump to force cooling air through the disc.
The rotor and hat have a floating mount system, which utilizes 10 high strength alloy steel drive pins, manufactured by Girodisc to our own specifications and cadmium plated for a long lasting corrosion resistance. These pins take the load from braking actions while maintaining the axial and radial float between the hat and disc. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers on the rotor side which allow the rotor to grow with heat expansion but eliminate the rattle and noise associated with floating rotors. This float also allows the rotor to self center between the pads.