XYZ Racing Hollow Rear Brake Kit — Bmw 5 SERIES E 61 523 (2004-2010)

The E61 523’s estate body carries noticeably more mass over the rear axle than the equivalent saloon, and the Touring’s self-levelling rear suspension means it frequently runs loaded with people and luggage. That rearward weight bias asks far more of the standard rear discs under repeated heavy stops than most owners expect. The XYZ Racing Hollow Rear Brake Kit answers it with two-piece floating discs and a fixed multi-piston caliper sized specifically for this chassis.

This is rear-axle hardware for the 523 built between 2004 and 2010 – a pair of left and right rear calipers and discs – aimed at owners who want stronger, more consistent braking from a 5 Series that spends time fully laden or pressing on down a fast B-road. Three pad compounds and a full menu of caliper finishes let you match the kit to how you actually use the car.

What this brake upgrade does for your 2004-2010 Bmw 5 Series E 61 523

The two-piece floating disc design strips rotational and unsprung mass from each rear corner, which the E61’s self-levelling rear setup will quietly thank you for. A larger rotor diameter increases leverage at the rear axle, so the car stays flatter under braking instead of pitching its weight onto the front discs. The fixed caliper clamps more evenly than the sliding OEM unit, and the braided lines give a firmer pedal that holds its bite once the discs are hot. On a heavy Touring that mixes motorway miles with the occasional committed run, that means shorter, more repeatable stops and far less fade. The Street pad keeps it quiet and clean daily, Sport adds bite and heat range for fast road, and the Racing compound copes with sustained track-day braking without cooking.

About the Hollow Rear Brake Kit

The Hollow Rear Brake Kit is built around two-piece floating discs: the friction ring is machined to shed material it does not need, cutting weight while preserving the swept area and thermal mass that govern heat management, with the ring carried on an alloy bell. It pairs that disc with a fixed multi-piston caliper that resists flex under load far better than a single-piston floating design, and the caliper body is hollow-cast as standard – serious track users can add the Hollow Racing upgrade, which drops the dust cover for a 1000C rating and a two-year warranty. Three pad compounds span ordinary road use with the Street pad, a faster Sport pad, and a full Racing compound for circuit work, so the same kit suits a daily 523 or a track-prepped one. Discs can be specified drilled or slotted at the same price, and centre bells upgraded to two-tone anodized in five colours or to titanium. Painted caliper finishes – Red, Yellow, Gold, Black and Anodized Black – come at no extra cost, with Custom Color in any Pantone for £150, premium polished-forged Titanium, Polished Gold and Polished Silver, and candy Teal, Blue, Red and Orange also offered. Everything is sized as a direct rear-axle fit for the E61 platform rather than a generic conversion.

Fitment for the Bmw 5 Series E 61 523 (2004-2010)

This kit is cut for the rear axle of the Bmw 5 Series E 61 523, chassis code E61, covering build years 2004 to 2010. Confirm your exact chassis code and production year against the listing before ordering, then choose your pad compound, disc style and caliper colour when you order.

What buyers also search for

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• 5 Series E 61 523 rear caliper colours including Red, Yellow, Gold and Anodized Black
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Pick your pad compound, disc style and caliper colour above, and build yours when you order.