XYZ Racing Hollow Rear Brake Kit — Bmw 4 SERIES G23 (2WD/4WD) (2020-2026)

The G23-generation 4 Series puts real mass over its rear axle, and on a circuit that weight is what first turns a confident rear end into a vague, overheating one after a handful of hard stops from speed. This XYZ Racing hollow rear big brake kit for the BMW 4 Series G23 attacks that problem directly, adding thermal capacity and a firmer, more repeatable pedal where the factory rear setup runs out of patience.

Whether the car is a rear-drive 420i or an xDrive M440i, the rear brakes do more work than owners expect under trail braking and on corner entry. This kit, a pair of left and right rear calipers and matched discs, gives the back axle the headroom to keep doing that work consistently, lap after lap in a track session rather than fading away from it.

What this big brake kit does for your 2020-2026 BMW 4 Series

After fitting, the first thing you feel is a higher, more progressive pedal that does not sink as the discs heat. The two-piece floating disc design trims rotating mass at the rear, which sharpens how quickly the brakes respond and eases the load the suspension has to manage under hard deceleration. Three pad compounds let you match the kit to the car’s use: Street for quiet, low-dust road duty, Sport for fast-road and spirited B-road work with occasional track use, and Racing for sustained track abuse where stopping distances and fade resistance matter most. On an xDrive G23, the steadier rear bite also helps the car settle predictably as you load the chassis into a turn.

About the Hollow Rear Brake Kit

XYZ Racing’s hollow rear kit is built around lightweight two-piece floating discs paired with a performance rear caliper, a pair of left and right rear calipers designed to shed heat faster and resist the fade that kills a heavy coupe’s braking on repeat stops. The disc construction lowers unsprung and rotating mass at the rear axle without giving up disc strength. The caliper body is hollow as standard, with a Hollow Racing upgrade for serious track use, no dust cover, rated to 1000C and backed by a two-year warranty. Pad compound is configurable across Street, Sport and Racing options, so the same hardware suits a daily-driven 4 Series or a dedicated track tool. The included painted caliper finishes are Red, Yellow, Gold, Black and Anodized Black at no cost, with a Custom Color in any Pantone available to match the car. Discs come drilled or slotted at the same price, with centre-bell upgrades selectable at checkout. It is a rear-specific kit, intended to balance a front upgrade or restore rear capacity in its own right.

Fitment for the BMW 4 Series (2020-2026)

This kit is fitted to the BMW 4 Series G23 chassis, covering the 2020 to 2026 production span. Both rear-drive (2WD) and xDrive (4WD) variants of the G23 are catered for.

What buyers also search for

• BMW 4 Series G23 rear big brake kit for track days and fast road
• BMW 4 Series rear brake upgrade with Racing pad compound for fade resistance
• xDrive M440i rear brake kit options with lightweight two-piece discs
• BMW G23 rear caliper colour choices including red, gold and custom
• 2020-2026 4 Series rear brake kit that keeps daily driveability

Choose your pad compound and caliper colour from the options above when you order.