
XYZ Racing Hollow Rear Brake Kit — Audi Q3 F3 QUATTRO (2019-2026)
SKU: XYZ-BRK-BKR-AU-021-REAR
- IncludesRear axle pair (2 discs + 2 calipers)
- PositionRear
- Disc Ø330–421 mm
- Caliper pots6 / 8-pot
- Lead time10–15 working days
Fits Audi Q3 F3 QUATTRO (2019-2026)
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Caliper render for this kit:

The F3-generation Q3 carries its mass high and long, and on a quattro car the rear axle does more thermal work than owners expect: the all-wheel-drive split, the stability system trimming the back end on a damp roundabout, and the sheer kerb weight of a compact crossover all land on rear pads that were specified for ordinary commuting. This XYZ Racing rear brake kit replaces that compromise with a two-piece floating disc sized to actually shed heat between stops.
It is a rear-axle upgrade for the 2019-2026 Audi Q3 F3 Quattro aimed at owners who tow, cover fast motorway miles, or want the brake balance to stay honest when the front kit is already uprated. The point is consistency under repeat use, not a one-off hard stop.
What this brake kit does for your 2019-2026 Audi Q3 F3 Quattro
After fitment you feel a firmer, more linear rear pedal and a back axle that stops fading when the car is loaded and worked hard down a series of descents. The two-piece floating disc cuts unsprung and rotating mass while opening up internal paths for heat to escape, so a heavy Q3 holds its bite through traffic-light-to-traffic-light town use and longer downhill runs alike. Three pad compounds let you set the rear character to the car’s job: Street for quiet, low-dust daily driving, Sport for harder fast-road use, and Racing for sustained high-temperature work. Pairing a sharper, fade-resistant rear with the Q3’s quattro traction gives you a more planted, predictable platform when you lift and turn into a corner.
About the Hollow Rear brake kit
The kit centres on a two-piece floating disc, where the disc face is lightened and vented to lower thermal mass and improve cooling versus the solid OE rear setup on a vehicle this heavy. The caliper is hollow-bodied as standard to keep weight down, with an optional Hollow Racing build for harder use that removes the dust cover, is rated to 1000C and carries a two-year warranty. Included painted caliper colours are Red, Yellow, Gold, Black and Anodized Black at no extra cost, with a Custom Color in any Pantone for £150, premium polished-forged finishes in Titanium, Polished Gold and Polished Silver, and candy finishes in Teal, Blue, Red and Orange, so the rear hardware visible through the wheel matches the front and the rest of the build. Pad selection runs across three compounds, Street, Sport and Racing, letting you tune cold bite, fade threshold and disc wear to the way the car is actually driven. Because this is the rear element of a larger XYZ Racing braking package, a matched pair of rear calipers and discs with braided lines, it is built to complement a front big brake upgrade and preserve sensible front-to-rear balance rather than overpower the back axle. Everything is specified to the F3 Q3’s rear hub and caliper geometry.
Fitment for the Audi Q3 F3 Quattro (2019-2026)
This kit is the rear application for the second-generation F3 Audi Q3 in quattro form, covering the 2019 to 2026 model years. It is a rear-axle-specific package and assumes the four-wheel-drive layout; confirm your car is the F3 chassis and quattro driveline before ordering.
What buyers also search for
- Audi Q3 F3 rear brake upgrade for a heavy quattro crossover
- Q3 F3 two-piece floating disc kit that resists fade on long downhill and motorway runs
- Audi Q3 quattro rear big brake kit with Sport and Racing pad options
- F3 Q3 caliper colour choices to match a front brake upgrade
- Rear brake balance kit for towing and fast-road Q3 use
Pick your disc style, pad compound and caliper colour from the options above to build yours.
What’s in the kit
Rear axle kit — supplied as a complete bolt-on assembly.
- 2×Two-piece floating discs — 330–421 mm: you pick the exact diameter with the "Disc size" option
- 2×Lightweight aluminium centre bells
- 2×Forged aluminium calipers — 6 / 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: Electronic parking brake (EPB) compatible.
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.

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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