Girodisc BMW F8X M2/M3/M4 Rear Brake Disc Upgrade

Girodisc 370mm 2-piece Floating REAR Discs/Rotors for BMW F8X M2/M3/M4 (with BLUE calipers and standard Iron discs)

This application is for M2, M3 & M4 cars equipped with BLUE calipers and iron rotors.

If your car is equipped with carbon ceramic brakes or the factory optional extra 2NH SILVER calipers CLICK HERE

The Girodisc 2-piece rotor system is a direct replacement for the OE rotor, no modifications are necessary. The disc will bolt directly to the car and work with OE calipers perfectly. Once the Girodisc system is in place, simply replace the cast iron rotor when needed. The average Girodisc 2-piece rotor is approx 2kg lighter per rotor then the stock units. This reduction in rotational and unsprung weight allows for quicker acceleration and suspension response. By upgrading your brakes with lightweight high performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency. 

The central hat section of the rotor is made from strictly U.S. sourced 6061-T6 aircraft specification aluminium. The disc is made from Girodiscs 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 10 high strength alloy steel drive pins, manufactured by Girodisc in the USA to their 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 class 12.9 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 centre between the pads.

Once the Girodisc system is in place, simply replace the cast iron rotor when needed.

Sold/priced per pair.

Stock Images Used. Actual Product May Vary.