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) Brembo 2-piston rear brake and 300 mm rotor on a Mitsubishi Lancer Evolution VIII (2003-2005)?

Q: What is the factory spec for the OEM Evo VIII (2003-05) Brembo 2-piston rear brake and 300 mm rotor on a Mitsubishi Lancer Evolution VIII (2003-2005)?

Factory specification. Brembo 2-piston rear calipers on a 300 mm (11.8 in), 22 mm thick ventilated rotor (minimum 20.4 mm). Two Mitsubishi technical documents agree on 'ventilated': the 2003 US service manual (files dated December 2002 to January 2003) lists a ventilated rear disc, and the dated 2006 IX spec sheet lists a ventilated 300 x 22 mm rear. Note: MMNA's 2003 and 2004 press kits (undated marketing material) call the rear rotor 'solid'. Held at tier 2 because of that wording; a 22 mm thickness suggests a vented disc, but confirm before ordering rotors.

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 2-piston rear calipers on a 300 mm (11.8 in), 22 mm thick ventilated rotor (minimum 20.4 mm).

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) Brembo 2-piston rear brake and 300 mm rotor
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 2-piston rear calipers on a 300 mm (11.8 in), 22 mm thick ventilated rotor (minimum 20.4 mm). Two Mitsubishi technical documents agree on 'ventilated': the 2003 US service manual (files dated December 2002 to January 2003) lists a ventilated rear disc, and the dated 2006 IX spec sheet lists a ventilated 300 x 22 mm rear. Note: MMNA's 2003 and 2004 press kits (undated marketing material) call the rear rotor 'solid'. Held at tier 2 because of that wording; a 22 mm thickness suggests a vented disc, but confirm before ordering rotors.

Specs

rotor mm: 300 x 22
pistons: 2

Related build entries

Service the Brembos to factory limits

Other brakes fitment for the CT9A (Evolution VIII)

OEM Evo VIII (2003-05, all US trims) Brembo 4-piston front calipers with 320 mm rotors — Specification Factory spec

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 Lancer Evolution service manual, group 35A: service brakes — Mitsubishi Motors Corporation (mfr spec; read 2026-10-26; full page read)
Rear: 2-opposed piston, ventilated disc; effective dia. 252 x 22 mm; minimum 20.4 mm.
2003 Mitsubishi Lancer Evolution Press Kit — Mitsubishi Motors North America (editorial; read 2026-10-26; full page read)
“the rear uses a two-piston caliper and solid 11.8-inch (300 mm) rotor design”
2003 press kit wording.
2004 Mitsubishi Lancer Evolution Press Kit — Mitsubishi Motors North America (editorial; read 2026-10-26; full page read)
2004 kit repeats the 'solid' 300 mm wording.
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 IX: rear Brembo ventilated, 300 x 22 mm.

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