XYZ Racing Hollow Rear Brake Kit — Subaru IMPREZA STI (BREMBO) φ 315/φ 191 (2002-2004)

On a 2002-2004 Impreza STI, the rear axle does more braking work than most owners expect. The symmetrical AWD layout and the car’s rearward weight transfer under trail braking lean on the back discs hard, and on a sustained track session the rear is usually the first end to start fading. This XYZ Racing Hollow Rear Brake Kit answers that with 315mm two-piece floating rotors and a fixed caliper built to take repeat stops without going soft.

This is a rear big brake kit for the GDB chassis that already left the factory wearing Brembos, aimed at owners who have moved past road pace: circuit days, sprints, and hard B-road work where the EJ207’s turbo flat-four writes cheques the standard rear brakes struggle to cash. It is supplied as a matched pair of left and right rear corners.

What this brake kit does for your 2002-2004 Subaru Impreza STI

The two-piece floating disc strips rotating and unsprung mass from each rear corner, which the STI feels as quicker direction changes and less inertia when you get back hard on the brakes mid-corner. The larger 315mm swept area and the fixed caliper hold a firmer pedal deeper into a session, so the rear bias stays predictable rather than turning vague as the discs heat. Three pad compounds, Street, Sport and Racing, let you set how much rear bite you want against the front axle, which matters on an AWD car where front-to-rear balance decides how it rotates. Caliper finishes run from Red and Gold through Black, Anodized Black and Yellow to a Custom Pantone, so the kit can sit discreetly behind the wheels or stand out.

About the XYZ Racing Hollow Rear Brake Kit

The kit centres on a 315mm two-piece floating, hollow-vane rotor and a multi-piston fixed caliper sized for the rear of the GDB Impreza. The floating disc keeps the rotor light while letting the friction ring expand against its alloy bell, preserving the swept area and venting needed to pull heat out between corners, the exact failure point that turns a quick lap into a slow one. A fixed caliper resists the flex you get from a sliding design, and that is what delivers the firmer, more repeatable pedal under load; the caliper body is a hollow-cast forging as standard, with an optional Hollow Racing upgrade rated to 1000C, carrying a two-year warranty, for serious track use. Pad choice spans a Street compound for road and occasional track work, a Sport compound for harder fast-road use, and a Racing compound for circuit and sprint sessions. Calipers are painted Red, Yellow, Gold, Black or Anodized Black at no extra cost, with a Custom Color in any Pantone for £150 plus premium polished-forged and candy finishes, and disc faces come drilled or slotted at the same price with a centre-bell upgrade to anodized two-tone or titanium at checkout. Being a rear-specific kit, it is sized to work with the brake balance of the AWD STI rather than swamp the front end.

Fitment for the Subaru Impreza STI (2002-2004)

This rear brake kit is sized for the Subaru Impreza STI built between 2002 and 2004, the GDB chassis that shipped with the factory Brembo package. The Φ 315 rotor and φ 191 figures in the kit name confirm the rear specification for this generation. Check your STI’s exact build year against the 2002-2004 range before configuring.

What buyers also search for

• Subaru Impreza STI rear brake upgrade for track days and sprints
• GDB Impreza STI 315mm rear big brake kit with two-piece floating rotors
• Subaru Impreza STI rear brake fade fix for repeat stops on circuit
• 2002-2004 Impreza STI rear caliper colour options including Red, Gold and a Custom Pantone
• Subaru Impreza STI rear pad compound choices for road and racing use

Pick your pad compound and caliper colour from the options above, confirm the 2002-2004 fitment, and build your rear brake kit.