Big Brake Kit
XYZ Racing Hollow Front Brake Kit — Bmw 5 SERIES E 60 523 (2003-2010)
SKU: XYZ-BRK-BKF-BM-027-FRONT
- IncludesFront axle pair (2 discs + 2 calipers)
- PositionFront
- Disc Ø356–444 mm
- Caliper pots6 / 8 / 12-pot
- Lead time10–15 working days
Fits Bmw 5 SERIES E 60 523 (2003-2010)
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Caliper render for this kit:
The E60 523’s standard front brakes are sized to its entry-level N52B25 output, not to the 1,550 kg it registers on the scales when loaded and covering ground quickly on a fast A-road. Day-to-day the stock package manages adequately. Ask it for sustained hard stops, repeated trail-braking from speed, or a track day at Blyton where the same braking zone arrives every 90 seconds, and the fronts run out of thermal headroom before the rest of the car does.
The XYZ Racing Hollow front big brake kit for the BMW 5 Series E60 523 replaces that limited-capacity hardware with a single-axle front kit: a left and right pair of calipers on larger-diameter two-piece floating discs, accepting three pad compounds, Street, Sport, and Racing. The same kit covers the car’s full working range from daily commute to circuit session, without requiring a hardware swap between uses. Set yours at the configurator above.
What this brake kit does for your 2003-2010 Bmw 5 Series E 60 523
The larger front discs give the 523 a braking footprint that better reflects the E60’s actual weight and its characteristic nose-heavy balance under deceleration. The increased swept area spreads heat load across a greater disc mass, so pedal feel remains consistent through a sequence of hard applications rather than softening progressively as the smaller stock discs approach their thermal limit, and the two-piece floating construction reduces unsprung and rotating mass while letting the friction ring expand without coning.
Compound selection determines how the kit behaves across conditions. Street is the quiet, low-dust, year-round road default, with quick warm-up and low cold-bite. Sport raises the thermal ceiling and bite without taking the car off the road, making it the practical choice for mixed-use owners who track occasionally. Racing works best with heat in the pads and delivers a consistent, accurate release point when operating temperatures stay elevated through a full circuit session. Caliper finishes, from the included no-cost painted colours through to premium polished and candy options, let the hardware sit behind the spokes on its own terms.
About the Hollow Front Brake Kit
XYZ Racing’s Hollow brake series is built around a hollow-bodied caliper as standard and a larger-diameter two-piece floating front disc that replaces the standard fitment with a component offering greater swept area and substantially improved thermal capacity. The series is designed for front-engined saloons where the front axle carries the dominant share of deceleration load and where the stock braking hardware is the first component to reach its limit under sustained use. For hard track running the optional Hollow Racing caliper deletes the dust cover, is rated to 1000C, and carries a two-year warranty.
The kit ships with pad compound specified at point of order, Street, Sport, or Racing, so installation does not require an additional sourcing step. Disc style is drilled or slotted at the same price, centre bells upgrade to two-tone anodized in five colours or to titanium at checkout, and caliper finish choice includes the included Red, Yellow, Gold, Black, and Anodized Black at no extra cost, a Custom Color in any Pantone, premium polished Titanium, Polished Gold, and Polished Silver, and candy Teal, Blue, Red, and Orange. The front-only fitment is deliberate: on the E60 platform, the front brakes do the majority of the work, and upgrading the front end first delivers the clearest return in feel and fade resistance.
Fitment for the Bmw 5 Series E 60 523 (2003-2010)
This kit is confirmed for the BMW 5 Series E60 chassis in 523 specification, covering the full production span from 2003 to 2010. The E60 523 shared its front hub geometry across the standard petrol range, so the fitment applies to all production 523 variants within these years. If the car has had previous hub, suspension, or wheel bearing work, verify the front hub dimensions remain standard before ordering.
What buyers also search for
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Set your pad compound, caliper colour, and disc style above, and the kit is built to order.
What’s in the kit
Front axle kit — supplied as a complete bolt-on assembly.
- 2×Two-piece floating discs — 356–444 mm: you pick the exact diameter with the "Disc size" option
- 2×Lightweight aluminium centre bells
- 2×Forged aluminium calipers — 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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