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Big Brake Kit

XYZ Racing Hollow Rear Brake Kit — Audi 100 QUATTRO (1985-1990)

SKU: XYZ-BRK-BKR-AU-A001-REAR

  • IncludesRear axle pair (2 discs + 2 calipers)
  • PositionRear
  • Disc Ø380–421 mm
  • Caliper pots8-pot
  • Lead time10–15 working days

Fits Audi 100 QUATTRO (1985-1990)

Brake pad compound

Street: quiet, low-dust, strong cold bite for road driving. Sport: higher temperature range and more bite for fast road and occasional track. Racing: maximum fade resistance for sustained track use (noisier and dustier cold). Match the pad to how hard you actually brake.

Disc size

Caliper grade

Hollow is the standard caliper: a lighter hollow-body forged caliper with a dust cover and a 5-year warranty. Hollow Racing drops the dust cover for sustained high-temperature use (rated to 1000°C, 2-year warranty) — the track-grade choice.

Caliper colour

Painted colours are included. Polished-forged finishes are mirror-polished forged calipers (Titanium, Gold, Silver); candy colours are a deep, mirror-reflection paint. Both are premium upgrades — fuller detail further down the page.

Painted — includedTell us the exact Pantone (PMS) code you want the calipers painted.Polished forgedCandy
Disc style

Drilled discs (cross-drilled holes) vent gas and water and look aggressive; slotted discs (surface grooves) wipe the pad face clean and resist fade under sustained hard use. Same price — choose on looks or how you drive.

Centre bell

The centre bell is the CNC-machined aluminium hat that joins the disc to the hub. Standard anodized is included; a two-tone bell adds an anodized accent ring in your choice of colour; titanium is the lightest, forged option.

Carbon-ceramic rotor

Carbon-ceramic rotors are a special-order track upgrade: far lighter than steel, fade-resistant at extreme temperatures and extremely long-lived. The price follows the disc size you choose above. The standard two-piece steel rotor is included.

Configured price£3,000.00Inc. VAT

Lead time: 10–15 working days from payment


£3,000.00

Made to order. Full payment is taken at checkout. Production begins once payment is confirmed.

Pay by card, Apple Pay, Google Pay — or Klarna on eligible orders.

Caliper render for this kit:

XYZ Racing Hollow Rear Brake Kit — Audi 100 QUATTRO (1985-1990) — 380 mm
380 mm

The C3-generation Audi 100 Quattro carries its inline-five slung ahead of the front axle, so the standard rear brakes were always the junior partner in the braking equation. On a car this size, with full-time quattro adding mass over both axles, the factory rear discs heat-soak and go soft long before the fronts give up. This XYZ Racing Hollow Rear Brake Kit for the Audi 100 Quattro (1985-1990) puts a larger, better-ventilated rear setup behind the back wheels to rebalance how the car slows down.

It is a rear-axle upgrade, a matched pair of left and right rear calipers and two-piece floating discs, aimed at owners keeping these Type 44 saloons and estates on the road and working them hard: fast-road use, the occasional track session, or simply hauling a heavy executive Audi down from speed without the back end fading away. Pick the pad compound that matches how the car is actually driven.

What this brake kit does for your 1985-1990 Audi 100 Quattro

The most obvious change is rear-axle bite that holds up. The hollow-vane disc core sheds heat faster than the original solid setup, which matters on a 1,300kg-plus quattro that asks a lot of its brakes on a long descent or repeated stops. With more thermal headroom at the back, the pedal stays consistent and the car settles under braking instead of pitching onto tired front pads.

Pad compound is your call. Street keeps things quiet and low-dust for daily driving. Sport adds bite and heat range for fast road plus the odd circuit lap. Racing is the full track compound that sharpens initial response under sustained heat. The included caliper finishes – Red, Yellow, Gold, Black or Anodized Black, with any Pantone as a Custom Color – let the finish match the car, whether it is a sleeper restoration or a deliberate statement behind a set of period wheels.

About the Hollow Rear Brake Kit

The Hollow Rear Brake Kit is XYZ Racing’s rear-axle big brake package, built around a two-piece floating disc with a hollow-vane core that increases internal airflow and trims unsprung weight against a solid rotor. The larger swept area gives the pads more surface to bite, which is where the added stopping consistency comes from on a heavy car. The kit is sized for the rear of the Type 44 platform and runs as a fixed-caliper setup.

Disc face is drilled or slotted at the same price, and centre bell upgrades, two-tone anodizing in five colours or titanium, are selectable when you order. Pad material is specified at point of order across Street, Sport and Racing compounds. The caliper is hollow-body as standard, with premium polished-forged Titanium, Polished Gold and Polished Silver and candy Teal, Blue, Red and Orange beyond the included colours. A Hollow Racing caliper, with no dust cover, a 1000C rating and a two-year warranty, is there for serious track use. The thread running through all of it is rear braking that stays predictable as temperature climbs.

Fitment for the Audi 100 Quattro (1985-1990)

This kit is cut for the rear axle of the Audi 100 Quattro built between 1985 and 1990 – the C3 Type 44 quattro saloon and estate. It fits the rear position only and is intended to work alongside a matching front setup or a known-good front brake. Confirm your exact chassis and wheel clearance before configuring, as period 100 Quattros ran a range of wheel sizes.

What buyers also search for

  • Audi 100 Quattro rear big brake kit for fast-road and occasional track use
  • Audi 100 Quattro brake upgrade with Street, Sport or Racing pad compounds
  • Hollow-vane rear disc brake kit for the C3 Type 44 quattro
  • Audi 100 Quattro rear brake kit with included and premium caliper finishes
  • Rear-axle braking upgrade for heavy 1985-1990 Audi 100 Quattro saloons and estates

Set your disc style, pad compound and caliper finish for the Audi 100 Quattro rear brake kit and configure yours when you order.

What’s in the kit

Rear axle kit — supplied as a complete bolt-on assembly.

  • 2×Two-piece floating discs — 380–421 mm: you pick the exact diameter with the "Disc size" option
  • 2×Lightweight aluminium centre bells
  • 2×Forged aluminium calipers — 8-pot
  • 2×High-stiffness mounting brackets
  • 2×Braided stainless steel brake lines
  • 4×High-performance brake pads (1 set)
  • 1×Fitting hardware & tools pack

Parking brake: OE handbrake not retained — a hydraulic handbrake is required.

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 330–356mm (rear). Warranty is 2 years on oil leaks and 10 years on appearance. Built for professional racing and repeated track days.

Hollow Racing caliper

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).

Polished forged caliper finishes
Candy caliper colours

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.

Two-tone anodized centre bells
Same car

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