XYZ Racing Hollow Rear Brake Kit — Bmw 3 SERIES G 21 (2019-2026)

The G21 Touring carries noticeably more mass over its rear axle than the G20 saloon it shares the CLAR platform with, and that loaded rear end is exactly what the factory rear brakes start to resent once you ask them to work. Add a roof box, a full boot and a passenger or two, and repeated heavy stops bring on the fade that takes the bite out of a confident corner entry.

This XYZ Racing Hollow Rear Brake Kit for the BMW 3 Series G21 (2019-2026) addresses that directly, replacing the rear setup with two-piece floating discs and a fixed caliper that holds temperature far better through a sequence of hard stops. It is the rear half of a balanced upgrade for fast-road and track-day use, where rear brake stability is what lets the car settle rather than skate under trail-braking.

What this big brake kit does for your 2019-2026 BMW 3 Series G21

The two-piece floating disc trims rotating mass at the rear corners, which the G21’s electronically managed chassis reads as quicker, cleaner response to the brake pedal. You get firmer, more linear pressure and a pedal that stays high when the standard rear discs would be smearing heat into the fluid. Three pad compounds, Street, Sport and Racing, mean you can match the rear axle to how you actually drive, from a refined daily setup to a compound that shrugs off back-to-back lap sessions. On a rear-biased estate body, a stronger, more fade-resistant rear end also steadies the car under braking into a turn, so the brake balance front and rear stays settled rather than the back axle going light at the wrong moment.

About the Hollow rear brake kit

XYZ Racing’s Hollow series uses lightened two-piece floating discs to cut unsprung and rotating weight while opening up airflow for better heat shedding. The kit is sized as a genuine big brake upgrade for the rear axle, a pair of left and right rear calipers paired with those discs and a rigid caliper body for consistent clamping that resists the flex and taper you feel from a tired sliding caliper. The caliper 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. The three-stage pad choice covers the full spread of use: Street for road manners and low dust, Sport for spirited fast-road work, and Racing for sustained track temperatures. The included painted caliper finishes are Red, Yellow, Gold, Black and Anodized Black at no cost, with a Custom Color in any Pantone available so the visual matches the build behind the spokes. Discs come drilled or slotted at the same price, with titanium or two-tone anodized centre bells selectable at checkout. The engineering priority throughout is repeatable braking under heat, which is precisely where the original rear hardware on a loaded G21 runs short.

Fitment for the BMW 3 Series G21 (2019-2026)

This kit is specified for the BMW 3 Series G21 chassis across the 2019-2026 model run. It fits the rear axle as a direct big brake upgrade. Confirm your exact build before ordering so the caliper, disc and pad compound are matched to your car.

What buyers also search for

• BMW 3 Series G21 rear big brake kit for fast-road and track-day use
• BMW G21 Touring rear brake upgrade that resists fade under load
• BMW 3 Series rear brake kit with Street, Sport and Racing pad options
• XYZ Racing two-piece disc rear setup for the 2019-2026 3 Series
• G21 rear caliper colour options in red, yellow, gold or custom

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