
XYZ Racing Hollow Rear Brake Kit — Bmw 3 SERIES G 20 (2019-2026)
SKU: XYZ-BRK-BKR-BM-089-REAR
- IncludesRear axle pair (2 discs + 2 calipers)
- PositionRear
- Disc Ø356–421 mm
- Caliper pots6 / 8-pot
- Lead time10–15 working days
Fits Bmw 3 SERIES G 20 (2019-2026)
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Caliper render for this kit:

The G20 3 Series rides on BMW’s CLAR architecture with a multilink rear axle that handles traction in every rear-driven 320i, 330i and M340i. The XYZ Racing Hollow Rear Brake Kit for the Bmw 3 Series G 20 targets the back of that platform, where sustained heat and a long, soft factory pedal tend to show up first on a circuit.
This is the rear-axle half of a brake upgrade aimed at fast-road and track work, a pair of left and right rear calipers and matched two-piece floating discs with your choice of pad compound, so the rear brakes keep their bite through repeated heavy stops instead of going vague as temperatures climb.
What this brake kit does for your 2019-2026 Bmw 3 Series G 20
Fit this rear kit and the first thing you feel on your 2019-2026 Bmw 3 Series G 20 is a firmer, more progressive pedal that does not sink after a few hard applications. The fixed caliper flexes less than the sliding factory unit, so brake bias stays predictable as you trail the pedal into a corner, worth a lot on a tail-led RWD chassis that wants a settled rear. The internally vented two-piece discs shed heat faster and cut unsprung mass at each rear corner, helping the multilink axle stay composed over kerbs and mid-corner bumps. Choose the Racing compound for circuit days, Sport for fast-road with occasional track use, or Street for a quieter, low-dust daily setup.
About the Hollow rear brake kit
The Hollow rear brake kit is XYZ Racing’s weight-reduced rear-axle package for the G20 3 Series, a pair of left and right rear calipers with matched discs. The discs are vented, lightened two-piece floating rotors that pull heat out through internal vanes while trimming rotational and unsprung mass. The caliper body is hollow as standard for stiffness under load, with a Hollow Racing upgrade for serious circuit use, no dust cover, rated to 1000C and carrying a two-year warranty. Three pad compounds, Street, Sport and Racing, let you match friction level and initial bite to how the car is driven. The included painted finishes are Red, Yellow, Gold, Black and Anodized Black at no cost, with a Custom Color in any Pantone available to suit the build. Discs come drilled or slotted at the same price, with centre-bell upgrades selectable at checkout. Each part is sized for the rear of the G20, so the kit works as the back half of a balanced front-and-rear brake package rather than a standalone rotor swap.
Fitment for the Bmw 3 Series G 20 (2019-2026)
This kit is built specifically for the G20-generation Bmw 3 Series, covering the 2019 to 2026 model years. It mounts to the rear axle of the G20 saloon chassis and ties into the pad-compound and caliper-colour options above. Confirm your exact variant before ordering so the disc and caliper match your car.
What buyers also search for
- Bmw 3 Series G 20 rear big brake kit for road and track day use
- G20 3 Series rear brake upgrade that resists fade under repeated heavy braking
- Bmw 3 Series G 20 rear caliper colour options including red, yellow and gold
- Rear brake pad compound choice for the 2019-2026 3 Series G 20, Street, Sport or Racing
- Lightweight two-piece rear discs to cut unsprung mass on the G20 chassis
Pick your pad compound and caliper colour for the G20 3 Series 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 — 356–421 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: Electronic parking brake (EPB) compatible.
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.

Other products that fit this vehicle
Front & rear brake kits, coilovers and more for this car
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More XYZ products for the Bmw 3 SERIES G 20 appear here as the rest of the range publishes.