Big Brake Kit
XYZ Racing Hollow Front Brake Kit — Subaru LEGACY-B4~BL9 (2003-2009)
SKU: XYZ-BRK-BKF-SU-012-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 LEGACY-B4~BL9 (2003-2009)
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Caliper render for this kit:
Subaru’s BL Legacy GT presents its front brakes with a harder task than most of its contemporaries. The EJ20 or EJ25 engine sitting forward of the front wheel centres, combined with Symmetrical AWD hardware adding drivetrain weight to the nose, means the front axle absorbs more stopping energy than the car’s composed, understated character might suggest. Standard equipment copes on the road, but a BL9 taken to a track day or pressed hard on a sustained downhill reveals the thermal limits of stock iron quickly enough.
The XYZ Racing Hollow Front Brake Kit for the Subaru Legacy B4/BL9 (2003-2009) replaces the front setup with a matched pair of front calipers and two-piece floating discs for the left and right corners, giving the nose genuine capacity to handle heat that the stock configuration struggles to shed under pressure.
What this brake kit does for your 2003-2009 Subaru LEGACY-B4~BL9
The hollow-vane disc addresses the thermal problem directly. Rather than concentrating heat at the rotor faces the way a conventional vented disc does, internal channels draw air through the rotor body and shed it into the airstream, keeping pad interface temperatures lower through sustained braking sequences. On a hard-driven BL Legacy, where the front axle carries the combined weight of the EJ engine and AWD drivetrain forward of the wheel centres, that cooling capacity is meaningful rather than marginal. The two-piece floating discs pair an aluminium centre bell with an iron friction ring, holding the disc true through repeated heat cycles and trimming rotating mass at the wheel, while braided stainless lines give a firmer pedal than rubber hoses that swell under load.
Three pad compounds let the kit serve different uses from the same hardware. Street is the quiet, low-dust road default with periodic spirited driving; Sport adds bite and heat range for fast-road work and the occasional track session; Racing is a full circuit compound for drivers who put the BL9 on circuit regularly. The pad is specified when you order, and swapping compounds later is a routine service job.
About the Hollow Front Brake Kit
The defining element is the disc itself: a hollow-vane body that circulates air through the rotor more effectively than a conventional vented design while the two-piece floating construction reduces rotating unsprung mass. The big brake kit format brings a larger swept area at the front compared to the BL Legacy’s stock setup, adding braking surface and caliper rigidity precisely where sustained heat accumulates under hard use. The calipers are hollow-body as standard for stiffness without excess weight, supplied as a left-and-right pair covering the front axle.
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 LEGACY-B4~BL9 (2003-2009)
This kit covers the Subaru Legacy B4 (BL chassis) and BL9 from 2003 to 2009, the fourth generation of the Legacy nameplate and the one that established the B4 saloon as a credible performance option for drivers who found the Impreza’s profile too conspicuous, and fits the front axle as a left-and-right pair. Confirm your specific chassis code and current front brake specification before ordering, as UK-delivered and JDM-import BL Legacys of this period occasionally left the factory with differing front-axle configurations.
What buyers also search for
- Subaru Legacy BL BL9 front brake upgrade for track day and fast-road use
- Subaru Legacy B4 big brake kit with Street, Sport and Racing pad options
- XYZ Racing hollow brake kit for Subaru AWD saloons 2003 to 2009
- Legacy BL9 front caliper finish options including Red, Yellow, Gold, Black and custom Pantone
Select your pad compound, disc style and caliper finish when you order to match how the Legacy is actually used.
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 LEGACY-B4~BL9 appear here as the rest of the range publishes.