# Girodisc Rear Brake Discs 329x26 for Mercedes SL55 (R230) without P30 Package (2003–2008) – SL55 (R230) with P30 Package (2007–2

> Pair of Girodisc rear discs, 329 × 26 mm, part no.: A2-030. High-performance floating brake discs with aluminum hubs for the Mercedes SL55 (R230) without the P30 package (2003–2008); Mercedes SL55 (R230) with P30 package (2007–2008); Mercedes SL63 (R230) without P30 package (2009–2012); Mercedes SL63 (R230) with P30 package (2009–2012).

- URL: https://www.gt2i.com/en/brake-disk-for-bell/224482-girodisc-rear-brake-discs-329x26-for-mercedes-sl55-r230-without-p30-package-20032008-sl55-r230-with-p30-package-20072-3666618858074.html
- Reference: GIRO-A2-030
- Price: €1,733.40
- Brand: GIRODISC
- Availability: out of stock

## Description

Girodisc A2-030 rear brake discs (329 × 26 mm) improve heat management during repeated braking on the Mercedes SL55 (R230) without the P30 package (2003–2008), Mercedes SL55 (R230) with the P30 package (2007–2008), Mercedes SL63 (R230) without the P30 package (2009–2012), and Mercedes SL63 (R230) with the P30 package (2009–2012). Their cast-iron tracks and aluminum cups form a floating assembly designed to handle thermal stresses and facilitate the replacement of tracks subjected to wear. Sold in pairs, with one left disc and one right disc.
These rotors are intended for the rear axle of compatible vehicles in the configuration listed below. They retain the compatible caliper mounting; any required spacers and brake pad specifications must be followed.
The curved internal cooling fins channel air through the rotor to dissipate heat during repeated braking. The floating mounting minimizes stresses caused by thermal expansion differences between the rotor and the housing and helps the rotor center itself between the brake pads, maintaining consistent contact under heat.
The hub is made of 6061-T6 aluminum. The high-strength steel drive pins are cadmium-trimmed to resist corrosion. Spring washers minimize cold-mounting noise while allowing the necessary compression for the floating mount.
New brake pads must be installed with new discs or rotors. Their shape and compound must be compatible with the mounting, casting, and intended use; comply with the specific requirements for this part number and perform the prescribed break-in procedure.
Specifications for Girodisc A2-030 discs for compatible vehicles
Brand: Girodisc
PartNumber: A2-030
Position: rear
Sizes (diameter × thickness): 329 × 26 mm
Vehicles and models: Mercedes SL55 (R230) without P30 package (2003–2008); Mercedes SL55 (R230) with P30 package (2007–2008); Mercedes SL63 (R230) without P30 package (2009–2012); Mercedes SL63 (R230) with P30 package (2009–2012)
Braking surface: high-resistance cast steel
Packaging: Pair of complete rotors, one left and one right, with disc bells.
Housing: 6061-T6 aluminum
Construction: two-piece floating mounting design
Catalog part number: D2-030. Verify compatibility with the caliper generation before replacement.
Internal ventilation: directional curved fins
Manufacturing of main components: United States
Vehicles compatible with Girodisc part number A2-030
Mercedes SL55 (R230) without the P30 package (2003–2008)
Mercedes SL55 (R230) with P30 package (2007–2008)
Mercedes SL63 (R230) without P30 package (2009–2012)
Mercedes SL63 (R230) with P30 package (2009–2012)
Mercedes SL55 (R230) without the P30 package (2003–2008): Without the P30 package.
Mercedes SL55 (R230) with P30 package (2007–2008): With P30 package.
Mercedes SL63 (R230) without P30 package (2009–2012): Without P30 package.
Mercedes SL63 (R230) with P30 package (2009–2012): With P30 package.
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 A2-030 Mounting Requirements
Mercedes SL55 (R230) without P30 package (2003–2008): Without P30 package.
Mercedes SL55 (R230) with P30 package (2007–2008): With P30 package.
Mercedes SL63 (R230) without P30 package (2009–2012): Without P30 package.
Mercedes SL63 (R230) with P30 package (2009–2012): With P30 package.
Brake Pads and Braking System for Compatible Vehicles
Choose brake pads whose shape is compatible with the calipers, track, and/or A2-030 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 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
Replacing the pads alone helps keep the controlled rotors in good condition. 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 A2-030 for compatible vehicles
What are the sizes of the A2-030 discs for my vehicle? The part number shown measures 329 × 26 mm and is mounted on the rear axle. The diameter alone is not sufficient: also check the brake system version and mounting requirements.
Is the product sold in pairs? Yes. It includes a left and a right disc for the same axle. Both discs are shipped with their disc bells.
Do I need to replace the brake pads on my vehicle?Yes. Always install new brake pads with new rotors or new braking surfaces. Their shape and compound must be compatible with the A2-030 track and/or rotor and with 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 in 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 rotors, and an instruction manual for installing new tracks on existing rotors. Consult the document that applies to your specific task before you begin.
Key Features of Girodisc A2-030 Bowl Brake Discs
329 × 26 mm size for rear braking on compatible vehicles.
6061-T6 aluminum rotor and floating mount to manage thermal stresses.
Internal ventilation via curved fins to dissipate heat.
Replaceable pads to maintain a two-piece mounting.
Left/right pair identified for mounting.
Aluminum rotors help reduce unsprung and rotating mass compared to a comparable one-piece cast-iron disc.

## Features

- Product type: Brake disc on a Bol
- Diameter in mm: 329
- Position: Rear
- Thickness: 26