XYZ Racing Hollow Rear Brake Kit — Porsche 991 GT3 RS (2016-2019)

The 991 GT3 RS hangs its naturally aspirated 4.0-litre flat-six out behind the rear axle, and that weight bias means the back brakes earn their keep in a way front-engined cars never ask of theirs. Hard traction out of slow corners, trail-braking that keeps the nose loaded, and the relentless heat-soak of back-to-back track sessions all land on the rear end first. The XYZ Racing Hollow Rear Brake Kit for the Porsche 991 GT3 RS is built to give that axle the thermal capacity it needs when you are using all of the car.

This is a rear big brake kit – a matched pair of left and right calipers and two uprated discs – with a choice of three pad compounds (Street, Sport and Racing) so the same hardware can be specced for road commuting, hard fast-road use, or a car that lives on circuit. Caliper finishes run from the obvious Red and Yellow through Gold, Black and Anodized Black, with premium options for owners matching a build.

What this brake kit does for your 2016-2019 Porsche 991 GT3 RS

On a car that already brakes hard from the factory, the gains here are about consistency rather than a single big stop. The larger rear disc resists fade across a full session, so the pedal stays firm on lap eight the way it felt on lap one. The Racing compound bites harder and tolerates the temperatures a tracked GT3 RS generates under repeated heavy braking, the Sport pad covers committed fast-road driving, while the Street pad keeps cold bite and dust manageable for road miles. With rear-axle steering already sharpening the car’s turn-in, a stable, predictable rear brake helps you trail deeper without the back stepping out.

About the Hollow Rear Brake Kit

The kit pairs an oversized rear disc with a fixed multi-piston caliper sized for the 991 platform, raising thermal mass and clamping area over the standard rear setup. The hollow-vane rotor cuts rotating and unsprung mass while opening internal airflow, and the two-piece floating disc, fed by braided lines, keeps its face flat and the pedal firm under heat. Compound choice is where you tune the character: the Street pad suits road and occasional track, the Sport pad adds bite and temperature range for committed fast-road driving, and the Racing pad is the one for circuit work where heat is the enemy. All three run on the same caliper and disc, so you can change the car’s braking personality with a pad swap rather than new hardware. Calipers are hollow-bodied as standard, with an optional Hollow Racing upgrade (no dust cover, rated 1000C, two-year warranty) for the hardest track use. Painted finishes are included free in Red, Yellow, Gold, Black and Anodized Black; a Custom Color in any Pantone is +£150, with premium polished-forged Titanium, Polished Gold and Polished Silver and candy Teal, Blue, Red and Orange finishes available. Discs are drilled or slotted at the same price, with two-tone anodized or titanium centre bells selectable at checkout.

Fitment for the Porsche 991 GT3 RS (2016-2019)

This kit is built specifically for the 991-generation Porsche GT3 RS across the 2016 to 2019 production span, fitting the rear axle. Confirm your car falls within that year range before ordering, and choose the pad compound to match how you actually use the car.

What buyers also search for

• Porsche 991 GT3 RS rear brake upgrade for repeat track-day sessions
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• Porsche 991 GT3 RS brake kit pad compound choices for fast-road driving

Pick your pad compound and caliper colour from the options above and build your 991 GT3 RS rear brake kit.