Our Top Recommended Big Brake Upgrade Kits For Your Subaru Impreza
Tell us your Impreza is a Turbo, a Turbo 2000, a WRX or a Sport and we can already tell you which brake kit fits, because on the classic Impreza they are all the same car underneath. Tarox list the kit four times over on the site, once per badge, so a search for any of those names lands on the right page. HiSpec do it the other way and cover the whole range under one listing marked WRX. Whichever badge is on the back of yours, it is the same kit.
Below are the kits we would actually fit, from the two brands we stock for big brakes: Tarox in northern Italy and HiSpec Motorsport in Dartford. The full Impreza range is on the site if you want to browse it raw.
- Tarox list the same kit under four Impreza badges: Turbo, Turbo 2000, WRX and Sport. Buy under whichever one matches your logbook
- HiSpec's 315mm kit clears a 16 inch wheel; Tarox's own 315mm kit needs a 17 inch wheel. Same disc size, different caliper, different minimum
- Every kit on this page, from both brands, arrives with pads, braided hoses and brake fluid included
- There is no Billet 4 kit for the Impreza. HiSpec's range here starts at the wider Monster 4 caliper
What is on this page
Two brands, two ways of listing the same car
Both machine their own calipers from billet aluminium and build every kit for the specific car it is going on. Where they differ on the Impreza is how they list it.
Tarox
Built at the factory in northern Italy. Calipers are CNC machined from European billet alloy and hand assembled, discs are heat treated and hand balanced to 0.05mm. Every kit arrives complete: vehicle specific braided hoses and Corsa pads already fitted. On the Impreza, Tarox list the same kit four times over, once per badge: Turbo, Turbo 2000, WRX and Sport.
HiSpec Motorsport
Machined in Dartford from aerospace grade billet aluminium, calipers and pistons both. Made to order in up to 28 working days, with the caliper finished in your choice of black, red, blue, gold or silver. HiSpec cover the whole classic Impreza range under one listing, marked WRX, and the kits include pads, hoses and fluid as standard.
Wheel sizes: the 315mm trap
Both brands publish a minimum wheel size for every Impreza kit, HiSpec on the listing itself and Tarox on their own site, looked up per kit for this guide, not assumed. The one that catches people out is the 315mm disc. HiSpec’s 315mm Monster kit is designed to clear a 16 inch wheel. Tarox’s own 315mm kit needs a 17 inch wheel. Same disc diameter, different figure, because the two calipers are a different shape and sit differently behind the spokes. A minimum wheel size belongs to the kit, never to the millimetres alone, and this is the clearest example we have seen of why.
| Kit | Disc | Smallest wheel |
|---|---|---|
| HiSpec 315mm Monster 4 / 6 | 315mm | 16 inch |
| Tarox 306mm 6 pot Sport | 306 x 24mm | 16 inch |
| Tarox 315mm 6 pot Sport | 315 x 26mm | 17 inch |
| HiSpec 335mm Monster 4 / 6 | 335mm | 17 inch |
| HiSpec 360mm Monster 4 / 6 | 360mm | 18 inch |
| HiSpec 360mm Mega Monster | 360mm | 18 inch |
| Tarox 340mm Super Sport | 340 x 26mm | 18 inch |
| Tarox 360mm Grande Sport | 360 x 30mm | 18 inch |
HiSpec 315mm Monster 4: the way in
This is the smallest kit we would put on an Impreza, and the natural start point on 16 inch wheels. The Monster 4 is a four piston caliper machined from aerospace grade billet aluminium, with a pad a third bigger than HiSpec’s entry Billet 4 caliper elsewhere in the range, which the Impreza does not get as an option here. That bigger pad means more surface grip and better heat dissipation once the disc is doing real work. The kit arrives with EBC Redstuff pads, braided hoses and brake fluid all included, so there is nothing left to source separately.
- £1,365.00 inc VAT, pads, hoses and fluid included
- Fits behind 16 inch wheels
- 315mm two piece disc, curved vane rotor
- 4 piston Monster 4 caliper, aerospace grade billet aluminium
- Five caliper colours, made to order in the UK, up to 28 working days
HiSpec 335mm Monster 4 and Monster 6: the 17 inch pair
Once the car is on 17 inch wheels, this is the natural step up, and HiSpec list it both ways. The Monster 4 keeps the four piston caliper from the 315mm kit behind a bigger 335mm disc for more leverage and more surface to shed heat into. The Monster 6 is the six piston version of the same caliper: same pad size, but up to 63 per cent more piston area, which means a firmer pedal and more consistent bite as the disc gets hot. Garreth’s read: the Monster 4 is plenty for a fast road Impreza, the Monster 6 earns its extra cost on a car that sees regular track days.
- Monster 4 at £1,650.00, Monster 6 at £1,773.00, both inc VAT, both with pads, hoses and fluid included
- Both fit behind 17 inch wheels
- 335mm two piece disc, curved vane rotor
- Monster 4 is 4 piston, Monster 6 is 6 piston with up to 63% more piston area
- Five caliper colours, made to order in the UK, up to 28 working days
Tarox 315mm 6 pot Sport: the complete kit at 17 inch
Tarox list a smaller 306mm kit for the Impreza as well, and normally the smaller disc would be the cheaper one. Not here: the 306mm kit runs to £2,078.89 inc VAT, more than this 315mm kit at £2,045.00. We are not going to quietly point you at the dearer, smaller option, so if you are choosing between the two Tarox kits on price alone, the 315mm is the one to take, and it needs a 17 inch wheel, one size up from the 306mm’s 16 inch. The B32 caliper carries six pistons, the disc is a two piece floating design balanced to 0.05mm at the factory, and the kit arrives complete: braided hoses and Corsa pads already fitted.
- £2,045.00 inc VAT, complete, cheaper than the smaller 306mm Tarox kit
- Fits behind 17 inch wheels
- Corsa pads and braided hoses included and fitted
- B32, 6 piston caliper, hand assembled in Italy
- 315mm two piece floating disc, balanced to 0.05mm
HiSpec 360mm Monster 4 and Monster 6: the 18 inch pair
The same choice as the 335mm pair, one size up, for cars on 18 inch wheels or heading that way. The 360mm disc is HiSpec’s largest Monster fitment for the Impreza, and the Monster 4 and Monster 6 calipers sit over it exactly as they do at 335mm: same pad, four or six pistons, the six piston version worth the extra outlay once the car is doing proper circuit work, not just fast road miles. Both include pads, hoses and fluid, same as every HiSpec kit on this page.
- Monster 4 at £1,780.50, Monster 6 at £1,863.00, both inc VAT, both with pads, hoses and fluid included
- Both fit behind 18 inch wheels
- 360mm two piece disc, curved vane rotor
- Monster 4 is 4 piston, Monster 6 is 6 piston
- Five caliper colours, made to order in the UK, up to 28 working days
Tarox 340mm Super Sport: the flagship
The Super Sport is Tarox’s fast road and track flagship, and the largest kit they list for the standard Impreza fitment. The B34GT caliper uses sequentially sized pistons so the pads wear evenly across the face and the pedal stays consistent as things get hot. One note on the listing: the title says 10 pot. The kit contents and the caliper spec both say eight pistons, and that is what arrives. Minimum wheel is 18 inch. Pads, hoses and brackets are all in the box from Italy, same as the rest of the Tarox range.
- £2,610.00 inc VAT, complete
- Requires 18 inch wheels
- Corsa pads and braided hoses included and fitted
- B34GT caliper, 8 pistons despite the "10 pot" title, hand assembled in Italy
- 340mm two piece floating disc, balanced to 0.05mm
The two biggest kits we stock for the Impreza
Both brands go one step further than the flagship picks above, still on an 18 inch wheel, for the Impreza that wants the largest kit either company builds for it. HiSpec’s Mega Monster is their flagship caliper full stop: six pistons, a pad 70 per cent bigger than the Monster range, on the same 360mm disc as the Monster kits above but with a lot more clamping force behind it. Braided hoses are optional on this one, not included, everything else HiSpec fit as standard. Tarox’s 360mm Grande Sport sits a tier above the Super Sport, a 360 x 30mm disc under a ten piston caliper, complete as always with pads and hoses fitted.
What is actually in each box
Most of this series compares HiSpec kits priced without pads or hoses against Tarox kits that include them. The Impreza is different: every kit on this page, both brands, arrives with pads, braided hoses and brake fluid included. HiSpec’s Monster range specifically lists EBC Redstuff pads and two braided hoses as part of the kit, and only the Mega Monster leaves the hoses as an optional extra. So on this car the finished-price comparison is already fair without any speccing up, and the real choice comes down to caliper feel, disc size and which badge is on the back of the car.
| In the box | HiSpec | Tarox |
|---|---|---|
| Calipers | Monster 4/6 or Mega Monster, 6082 T6 billet aluminium | B32 or B34GT, billet alloy, hand assembled |
| Discs | Two piece floating, curved vane | Two piece floating, balanced to 0.05mm |
| Brackets and hardware | Included | Included |
| Braided hoses | Included (optional on Mega Monster) | Included |
| Pads | EBC Redstuff, included | Corsa pads, fitted |
| Brake fluid | Dot 5.1, included | Not listed separately |
| Caliper finish | Black, red, blue, gold or silver | Black, red, blue, green or gold anodised |
| Built in | Dartford, UK, up to 28 working days | Northern Italy |
Every kit on this page compared
| Kit | Disc | Caliper | Smallest wheel | Price inc VAT |
|---|---|---|---|---|
| HiSpec 315 Monster 4 | 315mm, 2P | 4 piston | 16in | £1,365.00 |
| HiSpec 335 Monster 4 | 335mm, 2P | 4 piston | 17in | £1,650.00 |
| HiSpec 335 Monster 6 | 335mm, 2P | 6 piston | 17in | £1,773.00 |
| Tarox 315 6 pot Sport | 315mm, 2P | B32, 6 piston | 17in | £2,045.00 |
| HiSpec 360 Monster 4 | 360mm, 2P | 4 piston | 18in | £1,780.50 |
| HiSpec 360 Monster 6 | 360mm, 2P | 6 piston | 18in | £1,863.00 |
| Tarox 340 Super Sport | 340mm, 2P | B34GT, 8 piston | 18in | £2,610.00 |
| HiSpec 360 Mega Monster | 360mm, 2P | 6 piston, big pad | 18in | £2,196.85 |
| Tarox 360 Grande Sport | 360mm, 2P | 10 piston | 18in | £3,210.00 |
Prices include VAT and were correct on 15 August 2026. Tarox minimum wheel sizes looked up from their own product pages per kit.
Common questions
My Impreza is badged Turbo, not WRX. Does this guide still apply?
Yes. Turbo, Turbo 2000, WRX and Sport are all the same classic Impreza generation, and both brands build one physical kit per disc size for it. Tarox list all four badge names separately so a search for your car's actual badge finds the kit; HiSpec cover the same car under a single WRX listing. Buy under whichever name is in front of you, it will fit.
Why does the 315mm HiSpec kit need a smaller wheel than the 315mm Tarox kit?
Same disc diameter, different caliper. HiSpec's Monster caliper and Tarox's B32 caliper are shaped differently and sit at a different distance from the back of the spokes, so the wheel that clears one will not automatically clear the other. Always check the minimum wheel for the specific kit, never assume it carries over from a same-sized disc on the other brand.
Why does the smaller Tarox kit cost more than the bigger one?
It genuinely does on the Impreza: the 306mm kit lists at £2,078.89 inc VAT against £2,045.00 for the 315mm. We are flagging it rather than explaining it away. If you are choosing between the two on price, the 315mm is both bigger and cheaper.
Do I need to buy pads and hoses separately?
No, not on the Impreza. Every kit on this page, HiSpec and Tarox both, includes pads and braided hoses, and HiSpec throw in brake fluid too. The only exception is the HiSpec Mega Monster, where the hoses are listed as an optional extra, not standard.
How long before it arrives?
HiSpec kits are made to order in Dartford, allow up to 28 working days. Tarox kits are built for the specific car at the factory in Italy and lead times vary through the year, so ask when you place the order and we will give you the current picture.
What we would actually fit
On 16 inch wheels, the HiSpec 315mm Monster 4 is our starting point, complete for £1,365.00 with nothing extra to buy. Stepping up to 17 inch, the Tarox 315mm 6 pot Sport is genuinely the better value of the two Tarox kits, bigger disc, lower price than the 306mm sitting next to it, so take that one over the smaller kit every time. If you want the HiSpec badge instead at 17 inch, the Monster 6 earns its money once the car sees track days; the Monster 4 is plenty for the road. On 18 inch wheels the Tarox 340mm Super Sport is our flagship recommendation, and for anyone wanting the outright biggest kit either brand builds for this car, the HiSpec Mega Monster or the Tarox 360mm Grande Sport are both there.
Ring us on 0115 9893488 with your wheel size and which badge is on the back of the car. Working out what clears and what fouls is Cameron’s corner of the business, so have the wheel spec handy and you will get a straight answer.