How reliable is this fitment answer?

Confidence: Reported (2 of 3). Stated by one reasonably reputable source (retailer, shop, magazine). Not independently confirmed. Based on 4 cited source(s), last verified 2026-10-26.

What is the factory spec for the OEM Evo VIII (2003-05, all US trims) Brembo 4-piston front calipers with 320 mm rotors on a Mitsubishi Lancer Evolution VIII (2003-2005)?

Q: What is the factory spec for the OEM Evo VIII (2003-05, all US trims) Brembo 4-piston front calipers with 320 mm rotors on a Mitsubishi Lancer Evolution VIII (2003-2005)?

Factory specification. Brembo front brakes: 4-piston opposed calipers on ventilated rotors, 320 mm (12.6 in) across per MMNA's 2003 press kit (manufacturer marketing, treated as undated). The 2003 service manual gives 4-piston ventilated discs, 32 mm thickness (minimum 29.8 mm) and a 263 mm 'effective diameter', which is measured at the pad's working radius rather than the outer edge, so the two figures do not conflict. The undated 2004 kit shows the same front brake and the dated 2006 IX sheet lists 320 x 32 mm for the IX, but no dated 2003-05 Mitsubishi document gives the 320 mm diameter for the VIII, so tier 2.

Added 2026-10-26 · Updated 2026-10-26

Short answer: Factory specification Reported

Verdict:Factory spec Reported confidence (2 of 3) · 4 sources

Factory specification: Brembo front brakes: 4-piston opposed calipers on ventilated rotors, 320 mm (12.6 in) across per MMNA's 2003 press kit (manufacturer marketing, treated as undated).

Years: 2003-2005 · Applies to: all US trims · 4 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 Evo VIII (2003-05, all US trims) Brembo 4-piston front calipers with 320 mm rotors
Vehicle	Mitsubishi Lancer Evolution VIII (2003-2005)
Years	2003-2005
Trim / condition	all US trims
Verdict	Factory spec Specification
Confidence	Reported 2 of 3 — Stated by one reasonably reputable source (retailer, shop, magazine). Not independently confirmed.
Last verified	2026-10-26 (date the cited sources were last read)

Details

Brembo front brakes: 4-piston opposed calipers on ventilated rotors, 320 mm (12.6 in) across per MMNA's 2003 press kit (manufacturer marketing, treated as undated). The 2003 service manual gives 4-piston ventilated discs, 32 mm thickness (minimum 29.8 mm) and a 263 mm 'effective diameter', which is measured at the pad's working radius rather than the outer edge, so the two figures do not conflict. The undated 2004 kit shows the same front brake and the dated 2006 IX sheet lists 320 x 32 mm for the IX, but no dated 2003-05 Mitsubishi document gives the 320 mm diameter for the VIII, so tier 2.

Specs

rotor mm: 320 x 32 ventilated
pistons: 4

Related build entries

Service the Brembos to factory limits

Other brakes fitment for the CT9A (Evolution VIII)

OEM Evo VIII (2003-05) Brembo 2-piston rear brake and 300 mm rotor — Specification Factory spec

This part on other generations

Nissan 240SX (S14, 1995-1998) — Fits with extra parts or work Fits with mods
Nissan 240SX (S13, 1989-1994) — Unclear — details missing Unclear

More for this car

All Mitsubishi Lancer Evolution VIII (2003-2005) fitment answers · CT9A (Evolution VIII) common problems
Newsletter archive: past issues with every new and corrected entry

Sources

2003 Mitsubishi Lancer Evolution Press Kit — Mitsubishi Motors North America (editorial; read 2026-10-26; full page read)
Front: ventilated 320 mm rotors, four-piston calipers.
2003 Lancer Evolution service manual, group 35A: service brakes — Mitsubishi Motors Corporation (mfr spec; read 2026-10-26; full page read)
Front: 4-opposed piston, ventilated; effective dia. 263 x 32 mm; minimum 29.8 mm.
2004 Mitsubishi Lancer Evolution Press Kit — Mitsubishi Motors North America (editorial; read 2026-10-26; full page read)
2006 Mitsubishi Lancer Evolution IX specifications (MMNA spec sheet) — Mitsubishi Motors North America (hosted by The Auto Channel) (mfr spec; read 2026-10-26; full page read)
2006: front 320 x 32 ventilated, 4-piston.

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

Report a correction — spotted an error or have a better source? Email hello@chassisdex.com.