# Girodisc 316x20 Rear Brake Discs for Subaru BRZ - Impreza WRX STI (2008-2017) - WRX with Brembo Calipers (2020)

> Pair of Girodisc rear brake discs, 316 × 20 mm, part no.: A2-095. High-performance floating brake discs on an aluminum hub for the Subaru BRZ; Subaru Impreza WRX STI (2008–2017); and Subaru WRX with Brembo calipers (2020).

- URL: https://www.gt2i.ch/en/brake-disk-for-bell/224460-girodisc-316x20-rear-brake-discs-for-subaru-brz-impreza-wrx-sti-2008-2017-wrx-with-brembo-calipers-2020-3666618857855.html
- Reference: GIRO-A2-095
- Price: CHF 1,152.26
- Brand: GIRODISC
- Availability: out of stock

## Description

The Girodisc A2-095 rear brake discs, measuring 316 × 20 mm, optimize consistent braking performance during spirited driving on the Subaru BRZ, Subaru Impreza WRX STI (2008–2017), Subaru WRX W, and vehicles equipped with Brembo calipers (2020). Their cast iron rotors and aluminum hubs form a floating assembly designed to manage thermal stresses and facilitate rotor replacement due to wear. Sold as a pair, including one left-side and one right-side rotor.
These rear discs 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 limits stresses caused by differences in thermal expansion 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-plated to resist corrosion. They are secured by Class 12.9 bolts and hardened washers. Spring washers minimize cold-mounting noise while allowing the necessary compression for the floating mount.
New pads must be installed with new discs or tracks. Their shape and compound must be compatible with the mounting, the cast iron, and the intended use; comply with the specific requirements for this part number and perform the prescribed break-in procedure.
Specifications for Girodisc A2-095 rotors for compatible vehicles
Brand: Girodisc
PartNumber: A2-095
Position: rear
Sizes (diameter × thickness): 316 × 20 mm
Vehicles and models: Subaru BRZ; Subaru Impreza WRX STI (2008–2017); Subaru WRX with Brembo calipers (2020)
Braking surface material: 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: D2-095. Verify compatibility with the caliper generation before replacement.
Internal ventilation: directional curved fins
Minimum thickness: 18 mm
Weight / weight reduction: Comparison stated in the manufacturer’s data sheet: approximately 4.99 kg per rotor versus 8.16 kg for the original, for a weight savings of 3.18 kg per rotor (6.35 kg per pair).
Overall height: 64 mm
Manufacturing of main components: United States
Vehicles compatible with Girodisc part number A2-095
Subaru BRZ
Subaru Impreza WRX STI (2008–2017)
Subaru WRX with Brembo calipers (2020)
Subaru BRZ: For Brembo calipers; rear pad brackets must be modified.
Subaru BRZ: The metal brake pads on the original equipment and certain aftermarket brake pads require adjustment to clear the brake disc mounting while retaining the parking brake. It is essential to follow the instructions and use pre-prepared brake pads when available.
Subaru Impreza WRX STI (2008–2017): Rear pad brackets require modification.
Subaru Impreza WRX STI (2008–2017): The metal brackets on the original equipment and certain aftermarket brake pads require adjustment to clear the brake disc mounting while retaining the parking brake. Be sure to follow the instructions and use pre-prepared brake pads when available.
Subaru WRX w and Brembo calipers (2020): performance pack and White series.
Subaru WRX w and Brembo calipers (2020): The metal brake pads on the OEM brake pads and certain aftermarket pads require adjustment to clear the brake disc mounting while maintaining the parking brake. It is essential to follow the instructions and use pre-prepared pads when available.
Each application is specific to its brake system, calipers, and any requirements for brake pads or spacers. Check these requirements before ordering.
Girodisc A2-095 Mounting Requirements
Subaru BRZ: For Brembo calipers; rear pad brackets must be modified.
Subaru BRZ: The metal brackets on the original equipment and certain aftermarket pads require adjustment to clear the brake disc mounting while retaining the parking brake. It is essential to follow the instructions and use pre-machined pads when available.
Subaru Impreza WRX STI (2008–2017): Rear pad brackets require modification.
Subaru Impreza WRX STI (2008–2017): The metal brake pads on the original equipment and certain aftermarket brake pads require adjustment to clear the brake disc mounting while retaining the parking brake. Be sure to follow the instructions and use pre-prepared brake pads when available.
Subaru WRX w and Brembo calipers (2020): performance pack and White series.
Subaru WRX w and Brembo calipers (2020): The metal brackets on the OEM brake pads and certain aftermarket brake pads require adjustment to clear the rotor mounting while maintaining the parking brake. It is essential to follow the instructions and use pre-prepared brake pads when available.
Brake Pads and Brake Systems for Compatible Vehicles
Choose brake pads whose shape is compatible with the calipers, the track, and/or the A2-095 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 flexible 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 calipers in good condition. Reusing a caliper 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 with each pad replacement.
FAQ — Girodisc A2-095 for Compatible Vehicles
What are the sizes of the A2-095 discs for my vehicle? The part number shown measures 316 × 20 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 hubs.
Do I need to replace the brake pads on my vehicle?Yes. Always install new brake pads with new brake discs or new braking surfaces. Use a compound suitable for cast iron and your specific use. The metal brackets on the original brake pads and on some aftermarket pads require adjustment to clear the brake disc mounting while maintaining the parking brake. It is essential to follow the instructions and use pre-prepared pads when available.
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 the Girodisc A2-095
316 × 20 mm size for rear braking on compatible vehicles.
6061-T6 aluminum bowl and floating mount to manage thermal stresses.
Internal ventilation via curved fins to dissipate heat.
Replaceable tracks 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: 316
- Position: Rear
- Thickness: 20