How reliable is this fitment answer?

Confidence: Limited (1 of 3). Forum, Reddit or anecdotal report, or ambiguous/partial detail. Treat as a lead to research. Based on 2 cited source(s), last verified 2026-10-26.

Will OEM 2018-19 STI Brembo 6-piston front calipers (340 mm rotor) fit a Subaru WRX and STI (VA, 2015-2021)?

Q: Will OEM 2018-19 STI Brembo 6-piston front calipers (340 mm rotor) fit a Subaru WRX and STI (VA, 2015-2021)?

Yes, with extra parts or work. Fits as a kit, per one retailer: the 2018+ STI 6-piston front / 2-piston rear Brembos fit 2015-2021 WRX and 2015-17 STI, but the rear kit cannot go on cars with an electronic parking brake. Needs OEM STI 18-inch or larger wheels (factory WRX wheels and 17s will not clear), STI-fitment rear lines on a WRX, and trimmed backing plates.

Added 2026-10-26 · Updated 2026-10-26

Short answer: Yes, with extra parts or work Limited

Verdict:Fits with mods Limited confidence (1 of 3) · 2 sources

Yes, with extra parts or work: Fits as a kit, per one retailer: the 2018+ STI 6-piston front / 2-piston rear Brembos fit 2015-2021 WRX and 2015-17 STI, but the rear kit cannot go on cars with an electronic parking brake.

Years: 2015-2021 · Applies to: WRX and 2015-17 STI (rear kit not for EPB cars) · 2 sources · Last verified 2026-10-26

Safety-critical part. Manufacturer sources are cited, but they disagree or are incomplete for this fitment, so this entry is held below "Confirmed". Have the work done or checked by a qualified professional and confirm figures and part numbers against the service manual or the manufacturer.

Part	OEM 2018-19 STI Brembo 6-piston front calipers (340 mm rotor)
Vehicle	Subaru WRX and STI (VA, 2015-2021)
Years	2015-2021
Trim / condition	WRX and 2015-17 STI (rear kit not for EPB cars)
Verdict	Fits with mods Fits with extra parts or work
Confidence	Limited 1 of 3 — Forum, Reddit or anecdotal report, or ambiguous/partial detail. Treat as a lead to research.
Last verified	2026-10-26 (date the cited sources were last read)

Details

Fits as a kit, per one retailer: the 2018+ STI 6-piston front / 2-piston rear Brembos fit 2015-2021 WRX and 2015-17 STI, but the rear kit cannot go on cars with an electronic parking brake. Needs OEM STI 18-inch or larger wheels (factory WRX wheels and 17s will not clear), STI-fitment rear lines on a WRX, and trimmed backing plates.

Specs

rotor mm: 340 x 30 ventilated
wheel class: 18-inch type
rear: 2-piston on 326 x 20 rotor (2019 manual)

Related build entries

Fit STI Brembos to a 2015-21 WRX

Other brakes fitment for the VA

OEM 2016-19 WRX (VA) front brake (2-piston floating caliper, 316 mm rotor) — Specification Factory spec
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
2004-2007 STI front Brembo calipers — Fits with extra parts or work Fits with mods

This part on other generations

Subaru WRX and STI (GE/GH/GR/GV, 2008-2014) — Fits with extra parts or work Fits with mods

More for this car

All Subaru WRX and STI (VA, 2015-2021) fitment answers · VA common problems
Newsletter archive: past issues with every new and corrected entry

Sources

Subaru STI 6-Piston/2-Piston Brembo Brake Kit — FastWRX.com (Mach V Motorsports, Subaru parts retailer) (vendor article; read 2026-10-26; full page read)
Fits 2008-2021 WRX and pre-2018 STI; not EPB rear; non-STI and 17-inch wheels do not clear.
2019MY WRX / WRX STI service manual G1720BE (book 19STI_US_EN, 2018-03-28) — Subaru Corporation (mfr spec; read 2026-10-26; full page read)
6-piston front 340 x 30, 18-inch type.

Summaries are in our own words. Fitment is not guaranteed — disclaimer.

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