Big Brake Kit
XYZ Racing Hollow Rear Brake Kit — Bmw 3 SERIES E 91 323 (OE185) (2006-2011)
SKU: XYZ-BRK-BKR-BM-45-A-REAR
- IncludesRear axle pair (2 discs + 2 calipers)
- PositionRear
- Disc Ø330–421 mm
- Caliper pots6 / 8-pot
- Lead time10–15 working days
Fits Bmw 3 SERIES E 91 323 (OE185) (2006-2011)
Added to basket ✓
Caliper render for this kit:
The E91 Touring carries its mass differently to the saloon. Load the boot for a track weekend or a tip run and the rear axle takes on weight the standard 323’s brakes were never sized to manage stop after stop. This XYZ Racing rear brake kit tackles that directly, replacing the OE185 rear setup on the Bmw 3 Series E91 323 with a pair of larger, better-cooled discs and a pair of uprated calipers that resist the heat which fades a loaded estate’s stoppers.
The N52-engined 323 is not about hauling down supercar speed, so this upgrade is about consistency rather than raw outright power. The rear axle on an E9x does genuine work under trail braking, and on a Touring body it does more of it again. A rear big brake kit restores the bite and firm pedal that the factory 323 loses once the discs heat-soak on a downhill B-road or a busy circuit session.
What this rear big brake kit does for your 2006-2011 Bmw 3 Series E91 323
The step up in rotor size gives the rear axle more thermal mass, so repeated heavy stops no longer push the pads past their working temperature. Three pad compounds let you match the kit to how the car actually lives: Street for quiet, low-dust daily Touring miles, Sport for fast-road bite with the odd track day, and Racing for weekends lapping a circuit. Pedal travel stays shorter and more predictable as the brakes warm, which makes the E91 easier to place on the way into a corner. Better rear bite also sharpens balance under trail braking, where a loaded estate tends to feel lazy on the standard discs.
About the rear brake kit
The kit pairs uprated calipers with two-piece floating discs larger than the OE185 fitment, the extra diameter doing most of the work in shedding heat. The floating ring expands on its alloy bell rather than against a fixed hat, which keeps the disc flat and resists warping under sustained load. The hollow-vane disc construction trims rotating mass at the same time, so cooling and weight saving go hand in hand. The three pad compound options cover the full spread of use: Street for quiet daily feel, Sport for stronger cold bite on fast road, and Racing for sustained high-temperature work. Caliper colour spans painted Red, Yellow, Gold, Black and Anodized Black at no extra cost, with premium polished-forged and candy finishes and a Custom Pantone option. The caliper body is hollow-cast as standard, with an optional Hollow Racing upgrade rated to 1000C for serious track use.
Fitment for the Bmw 3 Series E91 323 (2006-2011)
This kit is built for the E91 chassis 323 with the OE185 rear brake fitment, covering the 2006 to 2011 model years. It is a rear-axle kit, so check your current rear disc specification matches the OE185 reference before ordering. Confirm your chassis code and build year against the listing to be sure of an exact fit.
What buyers also search for
- Bmw 3 Series E91 323 rear big brake kit for road and occasional track use
- E91 Touring rear brake upgrade to fight fade under load
- 323 OE185 rear disc replacement with a choice of pad compounds
- Bmw E91 rear caliper kit in Red, Yellow, Gold, Black or a custom finish
- Rear brake bite upgrade for the 2006-2011 E9x estate
Pick your pad compound, disc style and caliper colour from the options above when you order.
What’s in the kit
Rear axle kit — supplied as a complete bolt-on assembly.
- 2×Two-piece floating discs — 330–421 mm: you pick the exact diameter with the "Disc size" option
- 2×Lightweight aluminium centre bells
- 2×Forged aluminium calipers — 6 / 8-pot
- 2×High-stiffness mounting brackets
- 2×Braided stainless steel brake lines
- 4×High-performance brake pads (1 set)
- 1×Fitting hardware & tools pack
Parking brake: Retains your original (OE) handbrake.
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 330–356mm (rear). 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 Bmw 3 SERIES E 91 323 (OE185) appear here as the rest of the range publishes.