What is the factory spec for the OEM 2008-14 WRX front brake (floating caliper, 294 mm rotor) on a Subaru WRX and STI (GE/GH/GR/GV, 2008-2014)?
Added · Updated
Short answer: Factory specification Confirmed
Verdict:Factory spec Confirmed confidence (3 of 3) · 3 sources
Factory specification: Factory 2012-14 WRX front brake: floating caliper with two 42.8 mm pistons on a 294 x 24 mm ventilated rotor, listed as the '16-inch type'; the rear is the '15-inch type' with a 286 x 10 mm solid rotor.
Safety-critical part. This spec is confirmed from manufacturer documentation (listed under Sources). Still check it against the factory service manual for your exact car, or have a qualified shop do or check the work.
| Part | OEM 2008-14 WRX front brake (floating caliper, 294 mm rotor) |
|---|---|
| Vehicle | Subaru WRX and STI (GE/GH/GR/GV, 2008-2014) |
| Years | 2012-2014 |
| Trim / condition | WRX (STI uses Brembo) |
| Verdict | Factory spec Specification |
| Confidence | Confirmed 3 of 3 — Backed by a manufacturer document, or two or more independent sources agree on a specific checkable fact. |
| Last verified | 2026-10-26 (date the cited sources were last read) |
Details
Factory 2012-14 WRX front brake: floating caliper with two 42.8 mm pistons on a 294 x 24 mm ventilated rotor, listed as the '16-inch type'; the rear is the '15-inch type' with a 286 x 10 mm solid rotor. The hosted 2009 manual copy lists the same brakes for the 2009 WRX.
Specs
- rotor mm: 294 x 24 ventilated
- pistons mm: 42.8 x2
- wheel class: 16-inch type
- rear: 15-inch type, 286 x 10 solid rotor
Other brakes fitment for the GE/GH/GR/GV
- OEM 2008-17 STI Brembo 4-piston front calipers (326 mm rotor) — Fits with extra parts or work Fits with mods
- OEM 2008-17 STI Brembo 2-piston rear calipers (316 mm rotor) — Fits with extra parts or work Fits with mods
- OEM 2018-19 STI Brembo 6-piston front calipers (340 mm rotor) — Fits with extra parts or work Fits with mods
- 2004-2007 STI front Brembo calipers — Fits with extra parts or work Fits with mods
- 2004-2007 STI rear Brembo calipers — Fits with extra parts or work Fits with mods
More for this car
- All Subaru WRX and STI (GE/GH/GR/GV, 2008-2014) fitment answers · GE/GH/GR/GV common problems
- Newsletter archive: past issues with every new and corrected entry
Sources
- 2012MY Impreza WRX & STI service manual G1130BE (book 12STI_US, 2011-08-23) — Subaru (Fuji Heavy Industries) (mfr spec; read 2026-10-26; full page read)WRX front 16-inch type: 294 x 24 vented, 42.8 x2; rear 15-inch type 286 x 10.
- 2014MY WRX & STI service manual, chassis section, G1180BE7 (book 14WRX_STI_US_EN, 2013-06-03) — Subaru (Fuji Heavy Industries) (mfr spec; read 2026-10-26; full page read)
- 2009MY Impreza service manual (applicable models GE*****, GH*****) — Subaru (Fuji Heavy Industries) (editorial; read 2026-10-26; full page read)2009 WRX: same front and rear brake sizes.
Summaries are in our own words. Fitment is not guaranteed — disclaimer.
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