Girodisc 400x38 Front Brake Rotors for BMW M2 - M3 - M4 (G8X) (2021+) with CCB

These Girodisc D1-322 front replacement braking surfaces (400 × 38 mm) allow you to replace the braking surfaces on your BMW M2, M3, and M4 (G8X) GIRODISC rotors with carbon-ceramic discs (2021+) while retaining the compatible rotors 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 when hot.

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

Specifications for Girodisc D1-322 tracks for compatible vehicles

• Brand: Girodisc
• PartNumber: D1-322
• Position: front
• Sizes (diameter × thickness): 400 × 38 mm
• Vehicles and models: BMW M2, M3, and M4 (G8X) with carbon-ceramic brake disks (2021+)
• Braking surface material: high-resistance cast steel
• Packaging: Pair of brake pads (one left, one right); brake 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 track-to-cup mounting assembly during reassembly.
• Related catalog part: A1-322.
• Internal ventilation: directional curved fins
• Number of internal fins: 72
• Minimum thickness: 36 mm
• Manufacturing of main components: United States

Vehicles compatible with Girodisc part number D1-322

• BMW M2, M3, and M4 (G8X) with carbon-ceramic rotors (2021+),

• BMW M2, M3, and M4 (G8X) with carbon-ceramic rotors (2021+): For vehicles equipped with factory carbon-ceramic brakes.
• BMW M2, M3, and M4 (G8X) with carbon-ceramic rotors (2021+): Use the original BMW pad shape for cast-iron rotors in carbon-ceramic calipers.

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

Girodisc D1-322 Mounting Requirements

• BMW M2, M3, and M4 (G8X) with carbon-ceramic rotors (2021+): For vehicles equipped with factory carbon-ceramic brakes.
• BMW M2, M3, and M4 (G8X) with carbon-ceramic rotors (2021+): Use the original BMW pad shape for cast-iron rotors in carbon-ceramic calipers.

Brake Pads and Brake Systems for Compatible Vehicles

Select brake pads whose shape is compatible with the calipers, track, and/or D1-322 rotors, 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 a 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 mountings, and the mounting instructions; this number does not constitute a guaranteed service life. Use a new mounting each time you replace the pads.

FAQ — Girodisc D1-322 for compatible vehicles

What are the sizes of the D1-322 tracks for my vehicle? The part number shown measures 400 × 38 mm and mounts to the front 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. Use a compound suitable for cast iron and your use. Use the original BMW pad shape for cast-iron rotors in carbon-ceramic calipers.

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 D1-322 Replacement Tracks

• 400 × 38 mm size for front 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 rotors are retained to preserve the benefits of the two-piece mounting on unsprung and rotating masses.