Sold in Pairs!
These are lightweight two piece rotors that are
made specifically to be used on the B5 S4 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 our
rotor is made from strictly U.S. sourced 6061-T6 aircraft specification
aluminum. The disc is made from our own proprietary cast iron, poured in
the USA and machined from start to finish in house at Girodisc. The rotor
utilizes 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 8 or 10 high strength alloy steel drive pins,
manufactured by Girodisc in the USA 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. The pins are secured by grade 12 cap screws with hardened washers. 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.
Once the Girodisc system is in
place, simply replace the cast iron rotor when needed.
***These rotors only fit the B5 S4,
C5 A6s and Allroads with the 2.7TT motor. This kit will not fit C5 A6s, RS6s,
or Allroads with the 4.2L V8.***