Big Brake Kit
XYZ Racing Hollow Front Brake Kit — Subaru IMPREZA GRB (STI) (2007-2013)
SKU: XYZ-BRK-BKF-SU-05-E-FRONT
- IncludesFront axle pair (2 discs + 2 calipers)
- PositionFront
- Disc Ø304–444 mm
- Caliper pots4 / 6 / 8 / 12-pot
- Lead time10–15 working days
Fits Subaru IMPREZA GRB (STI) (2007-2013)
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Caliper render for this kit:
Factory calipers do a creditable job on the GRB STI under normal road conditions, but the EJ257’s 300bhp-plus and the car’s 1,490kg kerb weight ask a great deal of those front rotors over sustained hard use. On a circuit or an extended mountain pass, heat builds in the front braking system faster than the stock setup can shed it: the pedal softens, confidence drops, and lap times follow. The XYZ Racing Hollow Front Brake Kit replaces the front braking hardware with a setup that copes with what serious driving actually generates.
Fitted to the GRB body’s front axle, the generation that introduced a wider track and revised suspension geometry over the preceding GD chassis, this kit is a matched pair of front calipers and two-piece floating discs for the left and right corners. With the AWD system channelling significant braking force through the front axle under threshold stops, thermal management here is no academic concern.
What this brake kit does for your 2007-2013 Subaru IMPREZA GRB (STI)
The GRB STI’s symmetrical AWD layout shifts braking bias forward hard under deceleration. The two-piece floating discs run an aluminium centre bell bolted to an iron friction ring, reducing rotating mass at the front axle so turn-in stays sharp immediately after braking, a characteristic the GRB STI rewards when the entry phase is tidy. The hollow-vane disc draws cooling air through the rotor body so heat sheds continuously, holding the pedal repeatable through a sequence of braking zones. Braided stainless lines are included for a firmer pedal than rubber hoses that swell under pressure.
Three pad compounds configure the kit to the use case. Street is the quiet, low-dust road default for daily and occasional spirited use; Sport adds bite and heat range for aggressive fast-road work and the occasional track day; Racing is a full circuit compound for sessions where elevated temperatures and repeated hard stops are the norm, holding its feel where stock compound fades once it climbs past its operating range.
About the Hollow Front Brake Kit
The kit is designed for high-load braking environments where standard rotor mass and pad compound become limiting factors. The hollow-vane disc draws cooling air through the rotor body, and the two-piece floating discs reduce rotational inertia at the front axle, a meaningful gain on a car as dynamically complex as the GRB STI, where front unsprung weight directly influences steering response and the feel of AWD torque distribution through the braking phase. The calipers are hollow-body as standard for stiffness without excess weight and install to the GRB STI’s front hub geometry without modification, supplied as a left-and-right pair.
Discs come drilled or slotted at the same price, so you can choose on looks or wet-weather feel. Included caliper finishes are Red, Yellow, Gold, Black and Anodized Black at no extra cost, with a Custom Color to any Pantone code for a small upcharge. Premium polished-forged finishes (Titanium, Polished Gold, Polished Silver) and candy finishes (Candy Teal, Candy Blue, Candy Red, Candy Orange) sit in a separate upgrade tier. Two-tone centre bells in five anodized colours, or a titanium bell, are selectable at checkout. For serious track use there is an optional Hollow Racing caliper, run without a dust cover, rated to 1000C and backed by a two-year warranty.
Fitment for the Subaru IMPREZA GRB (STI) (2007-2013)
This kit is confirmed for the Subaru Impreza GRB (STI) chassis, covering the 2007 to 2013 production run, and fits the front axle as a left-and-right pair. The GRB body generation spans the hatchback platform introduced in 2007 alongside the STI drivetrain and suspension package. Verify your chassis code against the GRB designation and confirm front hub specification against the listing before ordering. All fitment is front-axle only; rear hardware is not included in this kit.
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Confirm your chassis code, then select your pad compound, disc style and caliper finish when you order to build the kit to your spec.
What’s in the kit
Front axle kit — supplied as a complete bolt-on assembly.
- 2×Two-piece floating discs — 304–444 mm: you pick the exact diameter with the "Disc size" option
- 2×Lightweight aluminium centre bells
- 2×Forged aluminium calipers — 4 / 6 / 8 / 12-pot
- 2×High-stiffness mounting brackets
- 2×Braided stainless steel brake lines
- 4×High-performance brake pads (1 set)
- 1×Fitting hardware & tools pack
Choosing your spec
Every kit is built to order around the choices you make above. Here is what each option actually changes, so you can spec yours with confidence.
Brake pads — Street, Sport or Racing
Every kit ships with a full set of high-performance pads; the compound is your call.
Street is the right default for fast-road driving — a strong, progressive cold bite with low noise, low dust and long disc life. Sport raises the working temperature and adds bite and fade resistance for hard road use and the occasional track day, while still behaving on a cold morning. Racing is a track compound built for sustained abuse: huge fade resistance and bite once heat is in it, at the cost of more noise and dust when cold. Match the pad to how hard you actually use the brakes — there is no benefit to a race pad that never gets up to temperature.
Caliper grade — Hollow vs Hollow Racing
Hollow is the standard caliper on every kit: a hollow-body forged caliper, lighter than a solid one, fitted with a dust cover and backed by a 5-year oil-leak warranty. For most fast-road and spirited track use it is all the caliper you need.
Hollow Racing is the track-grade upgrade. It runs the same hollow body but without a dust cover (so there is nothing to melt at sustained high temperature), uses a twin-metal piston that isolates heat travelling from the disc to the oil seal, and is rated to 1000°C. Available 286–380mm (front). Warranty is 2 years on oil leaks and 10 years on appearance. Built for professional racing and repeated track days.
Caliper colour & finish
Painted colours (Red, Yellow, Gold, Black, Anodized Black) are included at no cost. Want an exact match to your car? Custom Color (+£150) paints the calipers to any Pantone code you supply (15–20 day lead time).
Polished Forged finishes are the flagship: a forged caliper given a mirror-polished surface treatment that shifts colour with the viewing angle. Beyond the looks, the polished surface dissipates heat better, resists rust and stands up to the weather. Choose Titanium (neochrome, +£350), Polished Gold (+£300) or Polished Silver (+£250). They look their best paired with a titanium centre bell. Care: clean only with a dilute neutral cleaner or water.
Candy colours (+£200) use a deep candy-paint and polishing process for a mirror-reflection, boutique finish — pick Teal, Blue, Red or Orange (shown below right).
Centre bells
The centre bell is the CNC-machined aluminium hat that joins the disc to the hub. The standard anodized centre bell is included. The Two-tone bell (+£200) adds an anodized accent ring — choose Red, Yellow, Orange, Purple or Silver right here at checkout. The Titanium centre bell (+£500) is a forged titanium bell (bolts not included) that finishes off the polished-forged look.
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More XYZ products for the Subaru IMPREZA GRB (STI) appear here as the rest of the range publishes.