Girodisc A1-154 Front Iron Rotor Conversion for Porsche GT3 / GT4 RS (PCCB Delete)

The Girodisc A1-154 Front Iron Rotor Conversion is engineered for Porsche owners looking to replace factory PCCB ceramic brakes with a high-performance iron rotor system. Designed for the Porsche 911 GT3, GT3 RS, GT2 RS (991), and 718 Cayman GT4 RS originally equipped with PCCB, this setup delivers superior thermal stability, expanded brake pad options, and improved serviceability for aggressive street and track use.

Unlike OEM ceramic rotors, the Girodisc system uses a motorsports-grade iron rotor paired with a lightweight aluminum hat and a fully floating mounting system. This conversion is designed to use the same brake pad shape as factory iron-equipped 991 GT3 models, reducing rotor mass while allowing far greater pad compound availability. Once installed, only the cast iron rotor rings need to be replaced, significantly lowering long-term maintenance costs. Sold and priced as a front pair.

Key Features

• Front iron rotor conversion for PCCB-equipped Porsche models

• Uses factory 991 GT3 iron rotor pad shape for improved pad availability

• Reduced rotor weight compared to PCCB-sized iron alternatives

• Two-piece floating rotor design for thermal stability

• Direct bolt-on replacement for OE PCCB front rotors

• Ideal for track, aggressive street, and endurance use

Technical Specs

• Position: Front

• Rotor Type: Two-piece floating iron rotor

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

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

• Vane Design: Curved internal vanes for centrifugal cooling

• Mounting 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 eliminate cold rattle

• Serviceability: Replaceable iron rotor rings

• Sold As: Pair

Fitment Notes

• Designed for vehicles originally equipped with PCCB ceramic brakes

• Requires brake pads matching 991 GT3 factory iron rotor pad shape

• PCCB pad shapes are not compatible due to annulus differences