Girodisc A1-100 Audi B7 RS4 380mm Front Brake Rotors (With Caliper Spacers)

The Girodisc A1-100 Front Brake Rotor System is a high-performance upgrade for the Audi B7 RS4, featuring larger 380mm two-piece floating rotors and included caliper spacers for direct installation. Compared to the factory 365mm front rotors, this setup delivers increased braking leverage, improved heat capacity, and reduced unsprung and rotational mass for enhanced performance on both street and track.

Despite the increase in rotor diameter, Girodisc’s lightweight two-piece design reduces overall weight to approximately 22.6 lbs per rotor versus 25.5 lbs for the OEM units. This reduction improves suspension response, steering feel, and acceleration while maintaining excellent durability under aggressive driving conditions. Once installed, only the cast iron rotor rings need to be replaced, lowering long-term service costs. Sold and priced as a front pair.

Key Features

• Oversized 380mm front rotor upgrade for Audi B7 RS4

• Includes caliper spacers for proper fitment

• Larger diameter than OEM (380mm vs 365mm) for increased braking force

• Reduced unsprung and rotational weight compared to factory rotors

• Two-piece floating design for superior heat management

• Direct bolt-on replacement with provided hardware

Technical Specs

• Position: Front

• Rotor Diameter: 380mm

• Rotor Type: Two-piece floating brake rotors

• Hat Material: U.S.-sourced 6061-T6 aircraft-grade aluminum

• Rotor Material: Girodisc proprietary cast iron (USA poured & machined)

• Approx. Rotor Weight: ~22.6 lbs each

• OEM Rotor Weight: ~25.5 lbs each

• Vane Design: Curved internal vanes for centrifugal air cooling

• Floating Hardware:

  • 12 high-strength alloy steel drive pins

  • Cadmium-plated for corrosion resistance

  • Class 12.9 cap screws with hardened washers

  • Anti-noise spring washers to prevent cold rattle

• Serviceability: Replaceable cast iron rotor rings

• Sold As: Pair

Vehicle Fitment

• Audi RS4 (B7) – 2006–2008

  • Front 380mm setup using included caliper spacers