Big Brake Kit
XYZ Racing Hollow Front Brake Kit — Toyota CELICA ST185 (φ-φ 81-87) (1989-1993)
SKU: XYZ-BRK-BKF-TO-07-A-FRONT
- IncludesFront axle pair (2 discs + 2 calipers)
- PositionFront
- Disc Ø286–444 mm
- Caliper pots4 / 6 / 8 / 12-pot
- Lead time10–15 working days
Fits Toyota CELICA ST185 (φ-φ 81-87) (1989-1993)
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Caliper render for this kit:
The ST185 GT-Four arrived in 1989 as Toyota’s Group A WRC homologation device wearing Celica badges: all-wheel drive, 3S-GTE turbocharged, and fundamentally a competition car given a road registration. Three decades of hard use later, the original front brakes are working against a platform that was always driven with intent and hasn’t grown lighter with age.
This XYZ Racing Hollow front big brake kit with the φ-φ 81-87 caliper specification addresses what those factory units were never built to sustain. The turbo engine’s mid-range torque compresses braking zones quickly, and the hollow-vane disc manages the resulting heat more aggressively than a standard vented casting can. Three pad compounds, Street, Sport, and Racing, let you set the kit to the way the car is actually used.
What this brake kit does for your 1989-1993 Toyota CELICA ST185
On an AWD GT-Four, the front axle carries a disproportionate share of the braking load: the car’s traction means drivers carry more speed into corners before they commit to the pedal, which builds thermal demand at the front discs fast. The hollow-vane, two-piece floating disc moves air through the disc body, maintaining swept area and thermal capacity while reducing the rotating inertia the front suspension has to control across repeated stops, and braided lines firm up the pedal.
Three compounds let the owner calibrate to actual use. A GT-Four on track warrants a different compound to the same car on fast B-roads, and a system that accommodates both is more useful than a single racing-biased choice that destroys cold bite on a Tuesday commute. Street is the quiet, low-dust default, Sport adds bite and heat range for spirited road work, and Racing is the dedicated circuit compound. The caliper finish options acknowledge that surviving ST185 GT-Fours are increasingly regarded as the appreciating homologation specials they are.
About the XYZ Racing Hollow Front Brake Kit
The φ-φ 81-87 designation identifies the caliper piston geometry at the core of this kit, a paired-piston configuration matched to the front-corner loading profile of the ST185 platform. The hollow-vane, two-piece floating disc sets this brake kit apart from a conventional big-brake upgrade: air moves through the disc body, managing thermal mass precisely across sustained hard use while keeping rotating and unsprung weight in check at an axle that was never designed to carry unnecessary mass. The caliper is hollow-bodied as standard, and braided lines are included.
The three-compound range spans very different operating windows. Street is the quiet, low-dust default for general road use, Sport handles spirited driving and early track sessions, and Racing is for sustained elevated temperatures where a road compound would fade. Painted caliper finishes Red, Yellow, Gold, Black, and Anodized Black are included at no extra cost, with a Custom Color in any Pantone at £150 and premium polished-forged and candy finishes also offered. The construction reflects the dual-purpose reality of most ST185s on the road in 2026: driven hard when the opportunity arises, but not exclusively track tools.
Fitment for the Toyota CELICA ST185 (1989-1993)
This kit is developed for the ST185 chassis across the full 1989-1993 production span. The φ-φ 81-87 caliper specification is confirmed for this platform, covering the front axle position. If the car has been modified from standard front-corner geometry, with different hubs, aftermarket uprights, or a converted track setup, verify clearances against the kit dimensions before ordering.
What buyers also search for
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The compound, caliper colour, and disc style are all configurable; pick your spec using the options above.
What’s in the kit
Front axle kit — supplied as a complete bolt-on assembly.
- 2×Two-piece floating discs — 286–444 mm: you pick the exact diameter with the "Disc size" option
- 2×Lightweight aluminium centre bells
- 2×Forged aluminium calipers — 4 / 6 / 8 / 12-pot
- 2×High-stiffness mounting brackets
- 2×Braided stainless steel brake lines
- 4×High-performance brake pads (1 set)
- 1×Fitting hardware & tools pack
Choosing your spec
Every kit is built to order around the choices you make above. Here is what each option actually changes, so you can spec yours with confidence.
Brake pads — Street, Sport or Racing
Every kit ships with a full set of high-performance pads; the compound is your call.
Street is the right default for fast-road driving — a strong, progressive cold bite with low noise, low dust and long disc life. Sport raises the working temperature and adds bite and fade resistance for hard road use and the occasional track day, while still behaving on a cold morning. Racing is a track compound built for sustained abuse: huge fade resistance and bite once heat is in it, at the cost of more noise and dust when cold. Match the pad to how hard you actually use the brakes — there is no benefit to a race pad that never gets up to temperature.
Caliper grade — Hollow vs Hollow Racing
Hollow is the standard caliper on every kit: a hollow-body forged caliper, lighter than a solid one, fitted with a dust cover and backed by a 5-year oil-leak warranty. For most fast-road and spirited track use it is all the caliper you need.
Hollow Racing is the track-grade upgrade. It runs the same hollow body but without a dust cover (so there is nothing to melt at sustained high temperature), uses a twin-metal piston that isolates heat travelling from the disc to the oil seal, and is rated to 1000°C. Available 286–380mm (front). Warranty is 2 years on oil leaks and 10 years on appearance. Built for professional racing and repeated track days.
Caliper colour & finish
Painted colours (Red, Yellow, Gold, Black, Anodized Black) are included at no cost. Want an exact match to your car? Custom Color (+£150) paints the calipers to any Pantone code you supply (15–20 day lead time).
Polished Forged finishes are the flagship: a forged caliper given a mirror-polished surface treatment that shifts colour with the viewing angle. Beyond the looks, the polished surface dissipates heat better, resists rust and stands up to the weather. Choose Titanium (neochrome, +£350), Polished Gold (+£300) or Polished Silver (+£250). They look their best paired with a titanium centre bell. Care: clean only with a dilute neutral cleaner or water.
Candy colours (+£200) use a deep candy-paint and polishing process for a mirror-reflection, boutique finish — pick Teal, Blue, Red or Orange (shown below right).
Centre bells
The centre bell is the CNC-machined aluminium hat that joins the disc to the hub. The standard anodized centre bell is included. The Two-tone bell (+£200) adds an anodized accent ring — choose Red, Yellow, Orange, Purple or Silver right here at checkout. The Titanium centre bell (+£500) is a forged titanium bell (bolts not included) that finishes off the polished-forged look.
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More XYZ products for the Toyota CELICA ST185 (φ-φ 81-87) appear here as the rest of the range publishes.