XYZ Racing Hollow Rear Brake Kit — Subaru IMPREZA STI φ 315/ φ 190 (2014-2026)

The 2014-2026 Impreza STI puts more braking duty through its rear axle than most fast saloons. Its symmetrical all-wheel-drive layout keeps the back wheels loaded and driving hard out of corners, so the rear discs do real work shedding speed before turn-in, and the factory rear setup is the first thing to wilt under repeated heavy stops. The XYZ Racing Hollow Rear Brake Kit answers that with a larger 315mm two-piece floating disc and a fixed multi-piston caliper sized for sustained abuse.

This is a rear big brake kit for owners who already run their STI hard, whether on circuit, at sprint events, or on committed fast-road drives. Supplied as a matched pair of left and right rear corners, it restores rear bite and balance so the front axle is not left doing all the heavy lifting, and it pairs with your choice of pad compound to match how you actually use the car.

What this brake kit does for your 2014-2026 Subaru Impreza STI

The first thing you notice after fitting is a firmer pedal that holds consistent through three or four hard stops instead of going long. The 315mm rear disc adds thermal mass where the STI needs it most, so brake balance stays predictable once the rotors are hot. Offered in Street, Sport and Racing pad compounds, the kit lets you set rear bite for a daily commute, fast road or a full track day without swapping hardware. On a heavy AWD car that defaults to understeer, a stronger and more progressive rear brake also helps the chassis rotate into a corner under trail braking. The two-piece floating disc trims rotating and unsprung mass at the rear, sharpening how quickly the back axle reacts.

About the Hollow rear brake kit

The Hollow rear brake kit pairs a two-piece floating disc, which lets the friction ring expand against an alloy bell to cut thermal distortion without sacrificing swept area, with a hollow-cast caliper as standard. It runs a 315mm rear rotor clamped by a fixed multi-piston caliper, a clear step up in size and rigidity over the standard Subaru rear arrangement. That caliper is painted Red, Yellow, Gold, Black or Anodized Black at no extra cost, with a Custom Color in any Pantone for £150 plus premium polished-forged Titanium, Polished Gold and Polished Silver and candy Teal, Blue, Red and Orange finishes, so it can sit discreetly behind the spokes or stand out as part of the build. Three pad compounds, Street, Sport and Racing, let you tune initial bite and high-temperature stability to suit the work the car does, and a Hollow Racing caliper rated to 1000C with a two-year warranty is available for dedicated track use. Disc faces come drilled or slotted at the same price, and the centre bell upgrades to a five-colour anodized two-tone or titanium at checkout. The whole assembly is built to absorb the repeated high-energy stops that cook a factory rear brake on a powerful all-wheel-drive platform.

Fitment for the Subaru Impreza STI (2014-2026)

This is the rear application for the Subaru Impreza STI built between 2014 and 2026, using the φ 315 / φ 190 disc sizing listed in the product specification. Confirm your exact model year and check wheel clearance against the stated dimensions before ordering, since the larger disc and caliper need adequate room behind the wheel.

What buyers also search for

• Subaru Impreza STI rear big brake kit for track days and sprint events
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• Subaru Impreza STI rear brake kit with Street, Sport or Racing pad compound options
• Lightweight two-piece floating rear discs for a heavy all-wheel-drive Subaru
• Coloured caliper finishes for an Impreza STI rear brake upgrade

Choose your pad compound and caliper colour from the options above, then configure your kit.