Girodisc 380x32 Rear Brake Rotors for Porsche 911 (991) GT3 and GT3 RS (2013–2019) without CCB

The Girodisc D2-146 rear replacement braking surfaces (380 × 32 mm) allow you to replace the braking surfaces on your Porsche 911 (991) GT3 and GT3 RS (2013–2019) GIRODISC disc-and-cup brake system while retaining the compatible cups after inspection. These cast-iron pads maintain the floating mounting’s functionality and facilitate maintenance of a braking system subjected to repeated stress. Sold in pairs, without rotors.

The curved internal cooling fins channel air through the disc to dissipate heat during repeated braking. The floating mounting reduces stress caused by thermal expansion differences between the track and the hub and helps the track center itself between the pads, maintaining consistent contact even when hot.

New brake pads must be installed with new rotors or brake discs. Their shape and compound must match the mounting, cast iron type, and intended use; follow the specific requirements for this part number and perform the prescribed break-in procedure.

Specifications for Girodisc D2-146 rotors for compatible vehicles

• Brand: Girodisc
• PartNumber: D2-146
• Position: rear
• Sizes (diameter × thickness): 380 × 32 mm
• Vehicles and models: Porsche 911 (991) GT3 and GT3 RS (2013–2019)
• Braking surface: high-resistance cast steel
• Packaging: Pair of rotors, one left and one right; rotors not included.
• Compatible rotors: rotors from the corresponding Girodisc kit; check by part number; not universally compatible with OEM rotors.
• Mounting hardware: mounting kit included; replace the entire disc-to-hub mounting assembly during reassembly.
• Related catalog part: A2-146.
• Internal ventilation: directional curved fins
• Number of internal fins: 72
• Minimum thickness: 30 mm
• Original rotor diameter: 380 mm
• Manufacturing of main components: United States

Vehicles compatible with Girodisc part number D2-146

• Porsche 911 (991) GT3 and GT3 RS (2013–2019)

• Porsche 911 (991) GT3 and GT3 RS (2013–2019): Without PCCB.

Each application is subject to its specific brake system configuration, calipers, and any requirements for brake pads or spacers. Please verify these requirements before ordering.

Girodisc D2-146 Mounting Requirements

• Porsche 911 (991) GT3 and GT3 RS (2013–2019): Without PCCB.

Brake Pads and Brake System for Compatible Vehicles

Choose brake pads whose shape is compatible with the calipers, track, and/or D2-146 rotor, and whose compound is suitable for sport driving or track use. The Endless, pagid Racing, or Ferodo Racing ranges may be considered after verifying the appropriate part number.

For intensive use, we recommend compatible aviation-grade hoses and high-performance brake fluid that meets the vehicle’s specifications, along with proper bleeding and fluid replacement. This recommendation complements the mounting, which is compatible with the original hydraulic system.

Maintenance of the Girodisc mounting on compatible vehicles

When worn, replace the pads with the part number compatible with your existing rotors. Reusing a rotor for up to three pad replacements is subject to inspection of its condition, its mounting components, and the mounting instructions; this number does not constitute a guaranteed service life. Use a new mounting component each time you replace the pads.

FAQ — Girodisc D2-146 for compatible vehicles

What are the sizes of the D2-146 tracks for my vehicle? The part number shown measures 380 × 32 mm and mounts to the rear axle. The track height, mounting bracket, and cups must also be compatible with the mounting.

Is the product sold in pairs? Yes. It includes a left and a right component for the same axle. The brake shoes are not included.

Do I need to replace my vehicle’s brake pads?Yes. Always install new brake pads with new rotors or new braking surfaces. Their shape and compound must be compatible with the D2-146 track and/or rotor and the calipers. Then break in the rotors and pads according to the prescribed procedures.

How do I identify the left and right sides? Girodisc rotors come with a label attached to each rotor: LEFT for the left side and RIGHT for the right side, as viewed from the direction of travel. On a left-hand-drive vehicle, “LEFT” corresponds to the driver’s side and “RIGHT” to the passenger side. Follow these labels and the instructions. On models with curved internal fins, the rolling direction depends on this internal ventilation; the surface grooves alone are not sufficient to determine the side.

How do I break in this mounting on my vehicle? Follow the Girodisc procedure and the brake pad manufacturer’s instructions to build up an even transfer ply. The PDF documents below detail installation and break-in.

PDF Documents for Mounting and Break-in

We have included two PDF documents below: an instruction manual for installing and breaking in the discs, and an instruction manual for installing new tracks on existing bowls. Consult the document that applies to your specific task before you begin.

Key Features of Girodisc D2-146 Replacement Tracks

• 380 × 32 mm size for rear braking on compatible vehicles.
• Internal ventilation via curved fins to dissipate heat.
• Replaceable tracks to maintain a two-part mounting.
• Left/right pair identified for mounting.
• Compatible aluminum brake rotors are retained to preserve the benefits of the two-piece mounting on unsprung and rotating masses.