XYZ Racing Hollow Rear Brake Kit — Bmw 8 SERIES G 15 (NON M8) (2018-2026)

The G15-generation 8 Series carries close to two tonnes of grand-tourer mass on BMW’s CLAR architecture, and most of the braking conversation tends to centre on the front axle. The rear is where heat soak quietly builds, on a long alpine descent, or a string of high-speed motorway stops. The XYZ Racing Hollow Rear Brake Kit for the Bmw 8 Series G 15 (NON M8) targets exactly that, giving the back axle a larger, better-ventilated disc that recovers between stops instead of going soft.

This is a rear-specific kit for owners of the 840i, 840d and M850i who want braking balance to match a chassis they are actually leaning on. The hollow-vane disc trims rotational and unsprung mass at each rear corner, and the choice of Street, Sport or Racing pad compounds lets you set the bite to how the car is driven: autobahn GT, fast B-road, or the odd track day.

What this brake kit does for your 2018-2026 Bmw 8 SERIES G 15 (NON M8)

On a car this heavy, the first thing you feel is consistency. The larger hollow-vane rear disc stores and sheds heat more readily than the OE part, and its two-piece floating construction keeps the face true as it heats, so pedal feel stays firm through repeated heavy stops rather than going long and wooden. Cutting unsprung mass at the rear also sharpens how the back axle settles under braking and into turn-in. Pair the Racing compound with the bigger disc and you get stronger initial bite for track sessions; the Sport compound broadens the heat range for fast-road use, while the Street compound keeps things quiet and low-dust for daily driving. Caliper colour lets the kit read through the wheels exactly how you want.

About the Hollow Rear Brake Kit

The Hollow Rear Brake Kit takes its name from its hollow-vane disc, where the casting removes material from the internal structure without giving up swept friction area. The payoff is a brake that carries less rotational weight while keeping a large surface to dissipate heat, the two things that matter most on a heavy grand tourer. It is engineered as a dedicated rear upgrade, supplied as a matched left-and-right pair of two-piece discs with braided lines and brackets sized for the G15’s standard wheel package and matched to the car’s existing hydraulic circuit. Three pad compounds cover the realistic spread of use: Street for quiet, low-dust manners, Sport for stronger bite with a wider heat range, and Racing for sustained high-temperature work. The caliper is a hollow-body unit as standard, with an optional Hollow Racing version rated to 1000C and a two-year warranty for serious track use. Included painted finishes are Red, Yellow, Gold, Black and Anodized Black at no extra cost, with a Custom Color in any Pantone and premium polished-forged and candy options above that. Discs come drilled or slotted at the same price, and two-tone anodized or titanium centre bells are selectable. Taken together, the components are built to bring the rear axle’s stopping capacity up to the level the front and the chassis can already deliver.

Fitment for the Bmw 8 SERIES G 15 (NON M8) (2018-2026)

This kit is cut for the G15 8 Series in non-M8 specification, the 840i, 840d and M850i, across the 2018 to 2026 model years. It is a rear-axle fitment only; confirm your exact variant and rear wheel clearance before ordering. Front kits are listed separately.

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Choose your pad compound and caliper colour and confirm your variant using the options above to build your rear brake kit spec.