# Girodisc 305x28 Front Brake Rotors for Alfa Romeo 4C (2014–2020)

> Pair of Girodisc front brake pads, 305 × 28 mm, part no.: D1-078. Replacement cast-iron pads for Girodisc floating rotors, compatible with the Alfa Romeo 4C (2014–2020). Rotors not included.

- URL: https://www.gt2i.com/en/brake-rotor/224357-girodisc-305x28-front-brake-rotors-for-alfa-romeo-4c-20142020-3666618856827.html
- Reference: GIRO-D1-078
- Price: €873.12
- Brand: GIRODISC
- Availability: out of stock

## Description

These Girodisc D1-078 front replacement braking surfaces (305 × 28 mm) allow you to replace the braking surfaces on your Alfa Romeo 4C (2014–2020) GIRODISC floating caliper discs while retaining the compatible calipers 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, ensuring 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 configuration, cast material, and intended use; follow the specific requirements for this part number and perform the prescribed break-in procedure.
Specifications for Girodisc D1-078 rotors for compatible vehicles
Brand: Girodisc
PartNumber: D1-078
Position: front
Sizes (diameter × thickness): 305 × 28 mm
Vehicles and models: Alfa Romeo 4C (2014–2020)
Braking surface: high-resistance cast steel
Packaging: pair of rotors, one left and one right; discs not included.
Compatible rotors: rotors from the corresponding Girodisc kit; check by part number; not universally compatible with original equipment rotors.
Mounting hardware: mounting kit included; replace the entire disc-to-hub mounting assembly during reinstallation.
Related catalog part: A1-078.
Internal ventilation: directional curved fins
Minimum thickness: 26 mm
Original rotor diameter: 305 mm
Manufacturing of main components: United States
Vehicles compatible with Girodisc part number D1-078
Alfa Romeo 4C (2014–2020)
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.
Brake pads and braking systems for compatible vehicles
Select brake pads whose shape is compatible with the calipers, track, and/or D1-078 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 mounting that 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 D1-078 for compatible vehicles
What are the sizes of the D1-078 tracks for my vehicle? The part shown measures 305 × 28 mm and mounts on 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. Their shape and compound must be compatible with the D1-078 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 D1-078 Replacement Tracks
305 × 28 mm size for front braking on compatible vehicles.
Internal ventilation via curved fins to dissipate heat.
Replaceable tracks to maintain a two-piece 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.

## Features

- Product type: Alternative Track
- Diameter in mm: 305
- Position: Avant
- Thickness: 28