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Our Top Recommended Big Brake Upgrade Kits For Your Audi S3
There is no Tarox for the Audi S3. HiSpec are the only option, and the catalogue starts at 325mm on this car. The regular A3 begins at 285mm. Every kit here needs 17-inch wheels at minimum. HiSpec list the same six front kits across all S3 generations without distinction: the 8L, 8P and 8V all share the same range, so the generation of the car does not change the kit choice. The full Audi S3 range is on the site if you want to browse it.
Six kits run from £1,470.00 inc VAT at the 325mm Billet 4 entry to the 360mm Mega Monster at £2,196.85. Two disc sizes sit within the 17-inch window: 325mm (Billet 4) and 335mm (Monster 4 and Monster 6). Three 360mm kits step to 18 inch. One pricing note before you reach the table: the 360mm Monster 4 lists at £1,635.00, which is £15 less than the 335mm Monster 4 at £1,650.00. Both prices are correct, and both are flagged in the compare table.
- No Tarox coverage for the Audi S3; this guide is HiSpec Motorsport only
- All six kits need 17-inch wheels minimum; no S3 kit clears a 16-inch wheel
- No generation distinction in the catalogue: 8L (1999-2003), 8P (2006-2012) and 8V (2013-2020) all share the same six front kits
- 360mm Monster 4 (£1,635 inc VAT) lists below the smaller 335mm Monster 4 (£1,650): correct prices, flagged in the compare table
HiSpec: the only big brake option for the Audi S3
Tarox do not list a Sport kit for the Audi S3. Every kit on this page is HiSpec Motorsport, machined in Dartford from 6082 T6 billet aluminium. HiSpec make no generation distinction across the S3 range: the same six front kits cover the 8L, 8P and 8V. The catalogue starts at 325mm on this car, which means the entry Billet 4 here sits at a disc size where most guides in this series are already into Monster territory.
HiSpec Motorsport
Machined in Dartford from 6082 T6 billet aluminium, calipers and pistons both. Every kit is made to order in up to 28 working days, with the calipers finished in your choice of black, red, blue, gold or silver. Pads and braided hoses are priced separately so you pick the compound for the way the car is used.
Tarox for the S3
Tarox do not currently list a Sport kit for the Audi S3. If a Tarox listing appears in the catalogue we will stock it and update this guide. Ring us on 0115 9893488 if you want Cameron to confirm the current position before you decide.
Minimum wheel sizes
Minimum wheel diameter for HiSpec road calipers is a property of the kit, not the car: the same disc and caliper occupy the same radial space regardless of which vehicle they are fitted to. The figures below come from HiSpec’s own published statements across the catalogue. At 325mm and 335mm you need 17 inch. At 360mm you need 18 inch. No kit in the Audi S3 catalogue clears a 16-inch wheel.
| Kit | Disc | Minimum wheel |
|---|---|---|
| HiSpec 325mm Billet 4 | 325mm | 17 inch |
| HiSpec 335mm Monster 4 | 335mm | 17 inch |
| HiSpec 335mm Monster 6 | 335mm | 17 inch |
| HiSpec 360mm Monster 4 | 360mm | 18 inch |
| HiSpec 360mm Monster 6 | 360mm | 18 inch |
| HiSpec 360mm Mega Monster | 360mm | 18 inch |
HiSpec 325mm Billet 4: the 17-inch entry
The 325mm Billet 4 is the entry kit in the Audi S3 catalogue and the one HiSpec list for both the A3 and S3. The “A3-S3” label on the listing reflects the shared front hub at this disc size; the five Monster kits on this page carry the S3 name alone. Four pistons, a two-piece floating disc, external boots on the caliper to keep road grime out of the seals. Pads and hoses are priced separately, so budget for both alongside the kit price.
This is the sensible starting point for a road and occasional track car on standard S3 wheels. At £1,470.00 inc VAT it is a proper multi-piston conversion without moving into the Monster price range. Garreth’s view: if the car is on 17s and the use is road-biased, start here and add a good pad compound.
- £1,470.00 inc VAT
- Clears 17-inch wheels
- 325mm two-piece floating disc
- 4-piston Billet 4 caliper with external boots
- Pads and hoses priced separately; five caliper colours
HiSpec 335mm Monster 4: larger pistons on 17-inch wheels
The Monster 4 is the step up from the Billet 4 in clamping force. The pistons are larger, the pad is one third longer than on the Billet 4, and the caliper runs high-temperature seals and stainless steel wear plates that the Billet 4 does not carry. The disc grows by 10mm to 335mm, staying in the 17-inch window. At £1,650.00 inc VAT it is the natural choice for an S3 that does regular track evenings on 17s.
A pricing note: the 360mm Monster 4 below lists at £1,635.00, which is £15 less than this kit despite the larger disc. That pricing runs backwards between those two kits; both prices are correct. If the car is already on 18-inch wheels the 360mm section below is worth reading before you commit here.
- £1,650.00 inc VAT
- Clears 17-inch wheels
- 335mm two-piece floating disc
- 4-piston Monster caliper, larger pistons than Billet 4
- High-temperature seals and stainless steel wear plates
- Pads and hoses priced separately
HiSpec 335mm Monster 6: six pistons on the same disc
The Monster 6 runs the same 335mm disc as the Monster 4 with six pistons rather than four, giving up to 63% more piston area. The pad size is the same; the extra pistons clamp it with more force and give more feel at the pedal under hard use. On most road-going S3s the Monster 4 is enough. The six-pot version is for drivers who want a more progressive feel on circuit, or for a heavily modified car where the extra clamp is justified. Both share the same 17-inch wheel requirement.
At £1,773.00 inc VAT, the Monster 6 costs £123 more than the Monster 4 for the same disc size. Cameron’s take is that the difference is most noticeable on a dedicated track car; for a road car used at weekend events the Monster 4 is the usual choice. If you are not sure which suits the build, ring us on 0115 9893488 and we will ask the right questions.
- £1,773.00 inc VAT
- Clears 17-inch wheels
- 335mm two-piece floating disc
- 6-piston Monster caliper, up to 63% more piston area than Monster 4
- High-temperature seals and stainless steel wear plates
- Pads and hoses priced separately
The 360mm kits: moving to 18-inch wheels
Three kits share the 360mm disc: the Monster 4, the Monster 6 and the Mega Monster. All three need 18-inch wheels. Two pricing points worth noting before you look at the cards below. First, the 360mm Monster 4 lists at £1,635.00, which is £15 below the 335mm Monster 4 at £1,650.00. Bigger disc, cheaper price: the numbers run backwards on those two, and both are correct. Second, the Mega Monster uses a different caliper entirely from the Monster range, with 70% greater pad surface area and sequentially larger pistons. It is designed for disc sizes from 335mm to 400mm.
For a road-biased S3 on 18-inch factory wheels, the 360mm Monster 4 or Monster 6 is the proportionate choice. The Mega Monster suits a car set up specifically for circuit use. Garreth’s honest answer on the Mega Monster: most S3s that come through the door do not need it, and the 360mm Monster 4 gives a genuine upgrade without the step in price.
What is actually in each box
HiSpec price pads and braided hoses separately from the conversion kit on every S3 listing. The kit arrives with calipers, two-piece floating discs, mounting brackets and fitting hardware. Nothing is pre-installed in the pads slot. When you order, tell us the car and how it is used and we will quote the full build including pads and hoses, so you are comparing the finished cost.
HiSpec and Tarox compare differently on this point: Tarox include pads and hoses in the box on every kit in this series. On the S3 there is no Tarox option, so the box difference does not affect a direct comparison here. It is relevant if you are also looking at guides for other vehicles in the range.
| In the box | HiSpec all S3 kits |
|---|---|
| Calipers | Billet 4, Monster 4/6 or Mega Monster, 6082 T6 billet aluminium, Dartford |
| Discs | Two-piece floating, with mounting bells |
| Mounting brackets and hardware | Included |
| Braided hoses | Priced separately |
| Pads | Priced separately, your choice of compound |
| Caliper finish | Black, red, blue, gold or silver; select at order |
| Lead time | Made to order in up to 28 working days |
Every kit on this page compared
| Kit | Disc | Caliper | Min wheel | Pads and hoses | Price inc VAT |
|---|---|---|---|---|---|
| HiSpec 325mm Billet 4 | 325mm | 4 piston | 17 inch | Extra | £1,470.00 |
| HiSpec 335mm Monster 4 | 335mm | 4 piston | 17 inch | Extra | £1,650.00 |
| HiSpec 335mm Monster 6 | 335mm | 6 piston | 17 inch | Extra | £1,773.00 |
| HiSpec 360mm Monster 4 * | 360mm | 4 piston | 18 inch | Extra | £1,635.00 |
| HiSpec 360mm Monster 6 | 360mm | 6 piston | 18 inch | Extra | £1,863.00 |
| HiSpec 360mm Mega Monster | 360mm | 6 piston (larger pad) | 18 inch | Extra | £2,196.85 |
Prices include VAT and were correct on 16 September 2026. Wheel sizes from HiSpec’s own published statements across the catalogue, confirmed by the series wheel-sizes reference. * The 360mm Monster 4 at £1,635.00 lists £15 below the 335mm Monster 4 at £1,650.00; both prices are correct. All six products are published and in stock at the time of writing.
Common questions
Is there a Tarox option for the Audi S3?
Not currently. Tarox do not list a Sport kit for the Audi S3 in the catalogue. Every kit on this page is from HiSpec. If a Tarox listing appears we will stock it and update this guide. Ring us on 0115 9893488 if you want Cameron to confirm the current position.
Does this guide cover all three S3 generations (8L, 8P, 8V)?
Yes. HiSpec do not split the S3 range by generation. The same six front kits are listed across the 8L (1999-2003), 8P (2006-2012) and 8V (2013-2020) without distinction, so the generation you have does not change the kit you order. If the car has any non-standard front hub or strut geometry from an aftermarket modification, mention it when you order and we will confirm the fitment with HiSpec before it is built.
Why is the 360mm Monster 4 cheaper than the 335mm Monster 4?
The 360mm Monster 4 lists at £1,635.00 inc VAT and the 335mm Monster 4 at £1,650.00. The pricing runs backwards at that size: bigger disc, lower price. Both figures are correct as they appear in the HiSpec catalogue; it is a pricing anomaly, not an error. If you are choosing between the two on budget, the 360mm Monster 4 gives a larger disc for less money, but it needs 18-inch wheels, not 17. If the car is on 17s, the 335mm Monster 4 is the correct kit regardless of the price difference.
Why are pads and hoses not included?
HiSpec price pads and braided hoses separately so you choose the compound to match how the car is used. A road pad for a daily, something more heat-resistant for track use. Both can be added to the order and we will quote the full build so you know the finished cost before anything is ordered. Ring us on 0115 9893488 and we will put together a complete spec.
Will these work with the factory ABS and traction control?
HiSpec design their road kits for use with standard ABS and stability systems. For the S3 specifically, confirm the exact car spec when you order and we will check the fitment details with HiSpec before the kit is built. If the car has any modifications to the braking or stability hardware, mention those too.
What we would actually fit
On an S3 on standard 17-inch wheels used on the road and the occasional track day, the 325mm Billet 4. It is the entry kit, it clears the factory wheels, and at £1,470.00 inc VAT it is a proper multi-piston conversion from a manufacturer who makes the caliper and the disc in Dartford. Add a good pad compound and a set of braided hoses and you have a finished build without moving into Monster pricing.
For a car that does regular circuit sessions on 17-inch wheels, Garreth’s pick shifts to the 335mm Monster 4. Larger pistons, higher temperature seals, stainless wear plates: it is built for the work. If the car is on track regularly and brake feel matters more than cost, the 335mm Monster 6 gives more feel at the pedal for £123 more.
On 18-inch wheels, the 360mm Monster 4 is the honest first look: it is £15 less than the smaller 335mm Monster 4 and gives a larger disc. If the car is modified and going to a circuit more than twice a year, the 360mm Monster 6 is where we would go instead.
Not sure which suits the build? Ring us on 0115 9893488 with the wheel size and what the car does at weekends. Cameron handles the fitment and clearance side, so have the wheel make and size ready and he will narrow it down in about five minutes.