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Big Brake Kit

XYZ Racing Hollow Front Brake Kit — Alfa Romeo 155 Q4 4WD (1992-1997)

SKU: XYZ-BRK-BKF-AL-02-B-FRONT

  • IncludesFront axle pair (2 discs + 2 calipers)
  • PositionFront
  • Disc Ø330–444 mm
  • Caliper pots6 / 8 / 12-pot
  • Lead time10–15 working days

Fits Alfa Romeo 155 Q4 4WD (1992-1997)

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£2,000.00Inc. VAT

Lead time: 10–15 working days from payment


£2,000.00

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 Front Brake Kit — Alfa Romeo 155 Q4 4WD (1992-1997) — 330 mm
330 mm

The 155 Q4 4WD’s front axle manages the braking load of a turbocharged 2.0T alongside the weight transfer of a viscous-coupled all-wheel-drive platform, through front calipers specified to early-1990s standards and now into their fourth decade of service. This XYZ Racing front big brake kit replaces that ageing hardware with something more capable, and solves the increasingly practical problem of sourcing OEM-specification front brakes for a car whose production ended in 1997.

The Q4 was the rarest model in the 155 range: 4WD, turbocharged, and built in small enough numbers that owners keep them alive because they want to. The people still running 155 Q4s in 2026 are doing fast roads and the occasional circuit, and the original brake specification was never calibrated for that sustained thermal demand.

What this brake kit does for your 1992-1997 Alfa Romeo 155 Q4 4WD

Larger front discs give more swept area and more thermal mass to absorb heat from repeated hard stops, the two factors that decide how far you can push before the pedal goes soft. On the Q4 specifically, the all-wheel-drive system stabilises the car under trail-braking in a way the front-drive 155 Ti cannot, because the rear axle shares retardation load and keeps the car level when you carry brakes deep into a corner. The hollow-vane disc draws cooling air through the rotor body, and two-piece floating discs let the rotor expand without warping against the bell, so pedal feel stays consistent as heat builds.

Three pad compounds cover the range of use. Street is the quiet, low-dust road default. Sport adds bite and heat range for fast road and the odd track day. Racing is a circuit compound for sessions cycled through multiple heat cycles in a day. Discs are offered drilled or slotted at the same price.

About the Hollow Front Brake Kit

This kit is for the owner who wants meaningful fade resistance across road and track without running a full competition setup. The caliper is a hollow-body forging as standard, which takes unsprung and rotating mass off the front corners of a car already carrying a turbocharged iron block up front, while holding clamp rigidity under thermal load. For serious circuit use, the optional Hollow Racing caliper deletes the dust cover, is rated to 1000C, and carries a two-year warranty.

Calipers are painted in Red, Yellow, Gold, Black, or Anodized Black at no extra cost. A Custom Color in any Pantone shade is £150. Premium polished-forged finishes come in Titanium, Polished Gold, and Polished Silver, with candy finishes in Teal, Blue, Red, and Orange, sitting cleanly behind open-spoke alloys or making a deliberate visual point. Centre bells can go two-tone anodized in five colours or titanium, and braided lines firm the pedal. It is all chosen above when you order.

Fitment for the Alfa Romeo 155 Q4 4WD (1992-1997)

This front big brake kit covers the Alfa Romeo 155 Q4 4WD across its full production run from 1992 to 1997, supplied as a matched left-and-right pair for the front axle. The Q4 was the only all-wheel-drive model in the 155 lineup, distinct from the front-wheel-drive 155 Ti, 1.8 Twin Spark, and 2.5 V6 variants, and this fitment is specified for the Q4 4WD drivetrain only. Confirm your car carries the Q4 4WD designation before ordering.

What buyers also search for

  • Alfa Romeo 155 Q4 4WD front brake upgrade for track day and fast road use
  • 155 Q4 big brake kit to replace discontinued or hard-to-source OEM front brake components
  • Alfa Romeo 155 Q4 front brake kit with Sport and Racing pad compound options
  • Uprated front calipers for the Alfa Romeo 155 Q4 4WD in a choice of painted and premium finishes

Parts for the Q4 are only getting harder to find. Select your pad compound, disc style, and caliper colour from the options shown above when you order.

What’s in the kit

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

  • 2×Two-piece floating discs — 330–444 mm: you pick the exact diameter with the "Disc size" option
  • 2×Lightweight aluminium centre bells
  • 2×Forged aluminium calipers — 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.

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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