Big Brake Kit
XYZ Racing Hollow Front Brake Kit — Subaru IMPREZA GRB (WRX) (2007-2013)
SKU: XYZ-BRK-BKF-SU-05-A-FRONT
- IncludesFront axle pair (2 discs + 2 calipers)
- PositionFront
- Disc Ø286–444 mm
- Caliper pots4 / 6 / 8 / 12-pot
- Lead time10–15 working days
Fits Subaru IMPREZA GRB (WRX) (2007-2013)
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Caliper render for this kit:
The difference in front-end stopping hardware between the GRB WRX and its STI sibling has been a talking point in the Impreza community since the car launched in 2007. Where the STI got four-pot calipers as standard, the WRX made do with a single-piston sliding setup that was adequate for road use but undersized for the platform’s actual capability. Add the AWD system’s ability to carry speed deep into a braking zone and that gap becomes apparent. The XYZ Racing Hollow Front Brake Kit addresses it directly.
Available for the 2007-2013 Subaru Impreza GRB (WRX), the kit is a single-axle upgrade, a matched pair of front calipers and two-piece floating discs for the left and right corners, with pad compound, disc style and caliper finish all chosen when you order. That combination covers everything from daily use through fast-road driving to circuit sessions, without needing a different kit for each application.
What this brake kit does for your 2007-2013 Subaru IMPREZA GRB (WRX)
The AWD platform’s traction advantage means the GRB WRX arrives at braking zones with more speed than most comparable front-driven cars of the era, which puts a proportionally higher demand on the front calipers. A larger front brake package brings more braking force and better heat management, translating to consistent pedal feel across extended use. The hollow-vane disc draws cooling air through the rotor body so heat sheds continuously, keeping operating temperatures in the range where your chosen pad works as it should, and the two-piece floating discs pair an aluminium centre bell with an iron friction ring to hold the disc true through repeated heat cycles while trimming rotating mass at the wheel.
Three pad compounds let the same hardware serve different demands. Street is the quiet, low-dust road default that stays progressive in the wet; Sport adds bite and heat range for fast road with the occasional track day; Racing is a full circuit compound where initial bite and thermal stability under sustained braking matter most. Braided stainless lines are included for a firmer, more repeatable pedal than rubber hoses that swell under pressure.
About the Hollow Front Brake Kit
The hollow-vane name describes the disc’s internal ventilation. Cooling channels run through the rotor body and draw air across the friction surfaces while the wheel turns, the primary mechanism for keeping brake temperatures in check when the pedal is worked hard and repeatedly. The calipers are hollow-body as standard for stiffness without excess weight, and this is a front-only kit, which keeps brake bias straightforward and addresses the specific weak point in the WRX’s original specification, 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, which matters on a car as widely exhibited as the GRB. 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 (WRX) (2007-2013)
This kit is listed for the Subaru Impreza GRB (WRX) covering the 2007-2013 model years and fits the front axle as a left-and-right pair. The GRB designation covers the hatchback and saloon body styles in this generation, in WRX trim. Confirm your chassis code is GRB before ordering. This listing is for WRX specification; if your car is STI trim, which originally ran four-pot front calipers from the factory, check the appropriate STI-specific application.
What buyers also search for
- Subaru Impreza GRB WRX front brake upgrade to replace the stock sliding caliper setup
- GRB WRX big brake kit for circuit and fast-road use (2007-2013)
- Subaru Impreza WRX front brake kit with selectable Racing pad compound
- XYZ Racing front brake kit for Impreza GRB with caliper finish options
Choose 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 — 286–444 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 (WRX) appear here as the rest of the range publishes.