In this post we’ll cover the different types of brakes fitted to both the WRX & STi Impreza models.
Front Discs – 294mm Diameter
Rear Discs – 290mm Diameter
Front Calipers – 4 Pot
Rear Calipers – 2 Pot
Front Discs – 325mm Diameter – either 5×100 (earlier models) or 5×114.3pcd (later models)
Rear Discs – 316mm Diameter – either 5×100 (earlier models) or 5×114.3pcd (later models)
Front Calipers – Brembo 4 Pot
Rear Calipers – Brembo 2 Pot
1998-2000 Classic Impreza UK Spec (GC8)
The 1998-2000 UK models, often known as the “UK 2000” featured 4 pot cast front calipers and either 2 pot cast rear calipers or rear sliding calipers (build year dependant).
Front Discs Specification:
- 294mm Diameter
- 57mm Height
- 5 x 100 PCD (pitch circle diameter)
- Vented Brake Disc
Rear Discs Specification:
- 266mm Diameter
- 68mm Height
- 5 x 100 PCD (pitch circle diameter)
- Vented Brake Disc
Pad Layouts:
The front pads are approximately 120mm long, 70mm wide and 14mm thick (when new).
There are 2 types of rear pad, depending on which calipers you have, directly below is the pad layout for cast 2 pot calipers, these pads are 73mm long, 54mm wide and approximately 16mm thick from new:
The other type of rear pad found on the classic is used with the slider calipers, these feature tabs or “ears” on either side- the measurements of these are approximately 108mm long, 41mm wide and 14mm thick (from new).
Impreza WRX 2001-2007
The following section covers WRX models from 2001-2007, this includes Bugeye, Blobeye & Hawkeye with 5 speed transmission.
You can buy WRX brake discs and brake pads from our store by clicking here.
Front Discs Specification:
- 294mm Diameter
- 57mm Height
- 5 x 100 PCD (pitch circle diameter)
- Vented Brake Disc
Rear Discs Specification:
- 290mm Diameter
- 68mm Height
- 5 x 100 PCD (pitch circle diameter)
- Vented Brake Disc
Pad Layouts:
The front pads are approximately 120mm long, 70mm wide and 14mm thick (when new).
These rear pads are 73mm long, 54mm wide and approximately 16mm thick from new:
Impreza STI 2001-2007 (includes narrow & wide track)
This category includes Bugeye, Blobeye & Hawkeye models of STI with a 6 speed transmission, these were all fitted with gold coloured Brembo calipers from the factory.
Please note that in late 2004 Subaru switched from a 5 x 100 stud pattern (or PCD) to a 5 x 114.3 stud pattern- also know as widetrack.
The pads are the same throughout but the stud pattern on the discs differs, most (but not all) wide track models can be identified by the addition of the DCCD- driver controlled central diff.
If you are in any doubt as to whether your STI is a narrow or wide track, you can measure the PCD to make sure.
There are guides to do this, such as this one (click here).
Front Discs Specification:
Sub category- narrow track 2001-2004
- 325mm Diameter
- 53mm Height
- 5 x 100 PCD (pitch circle diameter)
- Vented Brake Disc
Sub category- wide track 2005-2007
- 325mm Diameter
- 53mm Height
- 5 x 114.3 PCD (pitch circle diameter)
- Vented Brake Disc
Rear Discs Specification:
Sub category- narrow track 2001-2004
- 316mm Diameter
- 68mm Height
- 5 x 100 PCD (pitch circle diameter)
- Vented Brake Disc
Sub category- wide track 2005-2007
- 316mm Diameter
- 68mm Height
- 5 x 114.3 PCD (pitch circle diameter)
- Vented Brake Disc
Pad Layouts:
The pad layout is the same for all STI models 2001-2007, whether narrow track or wide track, the calipers that hold the pads are the same.
Front pads are around 131mm long, 75mm wide and approximately 15mm thick from new:
STI rear pads are 76mm long, 65mm wide and around 14mm thick from new, illustrated below:
Impreza WRX 2008-2012 (Hatchback)
Moving on to the Hatchback models, this section covers the Hatchback WRX and special edition WRX-S.
Front Discs Specification:
- 294mm Diameter
- 57mm Height
- 5 x 100 PCD (pitch circle diameter)
- Vented Brake Disc
Rear Discs Specification:
- 286mm Diameter
- 64mm Height
- 5 x 100 PCD (pitch circle diameter)
- Solid Brake Disc
Pad Layouts:
Front pads on the WRX and WRX-S Hatchback are 137mm long by 57mm wide, the approximate thickness from new is 17mm.
Rear pads on the Hatchback WRX measure approximately 110mm long by 38mm wide, thickness from new around 14mm.
Impreza STI 2008-2018
Fitment for brakes on the STI remains the same all the way from 2008-2018.
This covers Hatchback STI, Saloon STI and latest generation WRX STI 2014-2018.
It does not cover the “Final Edition Impreza” 2018-2020 model year as these were fitted with a different special edition caliper.
Front Discs Specification:
- 325mm Diameter
- 53mm Height
- 5 x 114.3 PCD (pitch circle diameter)
- Vented Brake Disc
Rear Discs Specification:
- 316mm Diameter
- 64mm Height
- 5 x 114.3 PCD (pitch circle diameter)
- Vented Brake Disc
Pad Layouts:
Front pads are around 131mm long, 75mm wide and approximately 15mm thick from new:
STI rear pads are 76mm long, 65mm wide and around 14mm thick from new, illustrated below: