XYZ Racing Hollow Rear Brake Kit — Porsche 991 GT3 (2013-2019)

The 991 GT3 carries its flat-six behind the rear axle line, and that rearward mass keeps the back wheels working hard every time you lean on the pedal into a corner. The XYZ Racing Hollow Rear Brake Kit for the Porsche 991 GT3 is built to manage that load, giving the rear axle the thermal headroom and bite it needs once a front big brake upgrade has shifted the balance forward.

This is the rear half of a serious circuit braking setup – a matched pair of left and right calipers and two uprated discs. With racing-grade pad options and hollow-vane disc construction that sheds heat faster than a solid casting, it targets the repeated heavy stops a track-driven GT3 asks of its rear brakes, where standard friction material glazes and pedal balance starts to wander.

What this brake kit does for your 2013-2019 Porsche 991 GT3

Fit this kit and the first thing you feel on track is a firmer, more consistent rear pedal as the laps stack up. The hollow-vane disc pulls heat away from the friction surface quickly, keeping the rear pads inside their working window rather than fading after a handful of hard stops. Run the Racing compound for aggressive circuit bite, the Sport compound for fast road with the odd track day, or the Street compound for quiet, clean road use. The included caliper colours – Red, Yellow, Gold, Black and Anodized Black – let you set the look behind the GT3’s wheels, with premium finishes available. Because the 991’s rear axle sits under genuine mass, getting its braking right is what keeps the car stable and honest when you trail the brake to the apex.

About the Hollow Rear Brake Kit

The Hollow Rear Brake Kit matches a larger fixed caliper to a vented disc sized for the rear of the 991 GT3. The hollow-vane disc construction reduces rotating and unsprung mass while opening internal airflow, so heat generated under braking is carried clear instead of soaking into the hub and pads. The rotors are two-piece floating discs run on braided lines, keeping the face flat and the pedal firm under load. Three pad compounds are offered – Street for everyday driving, Sport for fast-road work, and Racing for sustained circuit duty – so the friction material can be matched to how the car is actually used. 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. As a rear-axle kit it is meant to run alongside a matched front setup, preserving the front-to-rear brake balance the GT3 depends on under hard deceleration.

Fitment for the Porsche 991 GT3 (2013-2019)

This kit is cut for the Porsche 991 GT3 built between 2013 and 2019, spanning both the early 991.1 and the later 4.0-litre 991.2 cars. It mounts to the rear axle and is intended to work with the GT3’s standard wheel fitment. Confirm your build year against the 2013-2019 range, then select pad compound and caliper colour from the options above.

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