Our Top Recommended Big Brake Upgrade Kits For Your Ford KA
Eight kits from £785 to £1,863 inc VAT, all for a car that weighed in at around 850kg. The Ford KA’s HiSpec range is wider than some heavier vehicles in this series, and the reason is the KA’s second life as a budget motorsport platform. Cup series, sprint events, club circuit work: a stripped and sorted KA is a quicker car than the factory spec suggests, and the bigger kits exist for those builds. There is no Tarox coverage for the KA in our catalogue, so this page is all HiSpec.
The range starts at a 278mm single-piece disc that clears 15 inch wheels and runs all the way to a 360mm Monster on 18s. Two kits sit at 300mm at very different price points because they use different disc constructions: one single-piece at £817 inc VAT, one two-piece at £1,464. Worth reading before you buy either. The full KA brake range is on the site if you want the complete listing.
- Eight HiSpec kits available, no Tarox coverage for the Ford KA
- Price range from £785.44 to £1,863.00 inc VAT; 15 to 18 inch minimum wheels depending on kit
- The new HISC-series kits do not include pads or braided hoses; you pick the compound when ordering
- HiSpec are made to order in Dartford; allow up to 28 working days from confirmed order
The HiSpec range for the Ford KA
HiSpec is the only brand in the KA catalogue. Tarox do not list a kit for this car, so there is no two-brand comparison to work through.
HiSpec are made to order at their facility in Dartford. Calipers are machined from billet alloy. Disc tolerances are held to individual kit specifications. Caliper colours available across the range are black, red, blue, gold and silver. Lead time is up to 28 working days from confirmed order. For the full HiSpec picture, the HiSpec Motorsport site carries their full catalogue.
One decision to make before ordering: pads. The two new HISC-series kits at 278mm and 300mm single-piece explicitly exclude pads and braided hoses. You specify the compound when you order and we add it to the build. HiSpec do this so you are not paying for a pad grade that does not suit how the car is used.
Billet 4 range
Four-piston caliper, covering 278mm to 325mm on the KA. The two smaller kits are new HISC-series listings with explicit pad and hose exclusions. The 325mm is an older-format listing. All Billet 4 kits on this car need 15, 16 or 17 inch wheels depending on disc size.
Monster range
Monster 4 and Monster 6 calipers at 335mm and 360mm. Larger caliper body, four or six pistons depending on which you choose. The 335mm needs 17 inch wheels; the 360mm needs 18s. Two caliper options at each size give you a choice on piston count for the build.
The wheel question
Each kit has a minimum wheel size fixed by the disc and caliper geometry. It does not change between cars. The 278mm Billet 4 is the only kit on this page that clears 15 inch wheels. If the KA is on standard 13 or 14 inch steels, no kit in this range will fit, and that is worth confirming before anything is ordered.
Diameter is only part of the answer. A wheel at the right diameter can still foul a caliper at the spokes if the spoke profile is shallow. Cameron handles the clearance checks on this side of the business. Give him the make and model of your wheels, not just the size, and he will confirm clearance before the kit goes to HiSpec. Tarox also publish a clearance template that applies equally well to HiSpec caliper dimensions.
| Kit | Disc | Minimum wheel |
|---|---|---|
| 278mm Billet 4 1P (HISC-009) | 278mm | 15 inch |
| 300mm Billet 4 1P (HISC-010) | 300mm | 16 inch |
| 300mm Billet 4 2P (older format) | 300mm | 16 inch |
| 325mm Billet 4 2P | 325mm | 17 inch |
| 335mm Monster 4 | 335mm | 17 inch |
| 335mm Monster 6 | 335mm | 17 inch |
| 360mm Monster 4 | 360mm | 18 inch |
| 360mm Monster 6 | 360mm | 18 inch |
278mm Billet 4 1P: the entry kit on 15 inch wheels
At £785.44 inc VAT, this is the entry point for the KA range and the only kit on this page that clears 15 inch wheels. The HISC-009 listing uses a four-piston billet caliper on a 278mm single-piece disc. For a road-driven KA or one used on sprint events, this kit does the job at a price that makes sense for the car.
Garreth’s take: the price is low for a billet four-piston conversion and this kit earns the money on a car this light. Single-piece disc is fine at this size and for the use cases most KA owners have in mind. Pads and hoses are not included with the HISC-009 listing, so budget for those alongside. Ring us when ordering and we will recommend a compound for how the car is used.
- £785.44 inc VAT
- 278mm single-piece disc, four-piston Billet 4 caliper
- Clears 15 inch wheels
- Pads and braided hoses not included (HISC-009 format); specify compound when ordering
- Made to order in Dartford; up to 28 working days from confirmed order
300mm at two price points: single-piece or two-piece disc
Two kits at 300mm, both needing 16 inch wheels, sitting £647 apart in price. The HISC-010 listing is a new-format single-piece disc at £817.24 inc VAT. The second 300mm kit is an older-format listing with a two-piece floating disc at £1,464.00 inc VAT. Both use a four-piston caliper; the disc construction is where they differ.
A two-piece floating disc separates the hat from the braking ring so the ring can expand thermally without distorting the face. On a road-driven KA or one doing occasional track sessions, the single-piece at £817 is the right call. On a car doing sustained circuit work where brake temperatures build over multiple laps, the two-piece handles that heat cycling better. If you are unsure which applies to how you use the car, ring Cameron and he will work through the build options with you.
- Single-piece 1P (HISC-010): £817.24 inc VAT
- Two-piece 2P (older format): £1,464.00 inc VAT
- Both use a four-piston Billet 4 caliper; both clear 16 inch wheels
- Pads and hoses not included on the HISC-010; confirm contents on the older listing before ordering
- Disc construction is the main difference; pick based on braking intensity
325mm Billet 4: more disc for a £6 step up from 300mm
The 325mm kit steps up to a 17 inch wheel requirement and a larger disc, but costs only £6 more than the older-format 300mm two-piece at £1,470.00 inc VAT. If the car is already on 17s and the budget is around £1,464 to £1,470, this is the obvious pick. More disc area for an almost identical outlay and a move up to the 17 inch wheel tier.
This is an older-format HiSpec listing. The disc is two-piece floating. Contents should be confirmed when you order. Cameron will check clearance on 17 inch wheels of any spoke profile; give him the wheel make and model at the time of enquiry and he will confirm before anything goes to build.
- £1,470.00 inc VAT
- 325mm two-piece floating disc, four-piston Billet 4 caliper
- 17 inch minimum wheel
- Older-format listing; confirm pad and hose contents when ordering
- Only £6 more than the older-format 300mm two-piece
335mm Monster 4 and Monster 6: moving to the Monster caliper
The Monster family uses a larger caliper body than the Billet 4, with either four or six pistons depending on which you choose. On the KA, both variants run a 335mm disc and both need 17 inch wheels. Monster 4 is £1,650.00 inc VAT; Monster 6 is £1,773.00 inc VAT. The six-piston version gives more pad area and a more progressive pedal feel under sustained braking loads.
For a circuit KA doing full days, the step from Billet 4 to Monster is worth the money. The larger caliper body handles heat better across a longer session. Both are older-format HiSpec listings, so confirm pad and hose contents when ordering. Garreth can advise on Monster 4 against Monster 6 if you want a straight call on which to run for your specific build.
- Monster 4: £1,650.00 inc VAT
- Monster 6: £1,773.00 inc VAT
- 335mm disc, 17 inch minimum wheel for both
- Monster 4 is four-piston; Monster 6 is six-piston; same disc, larger caliper body
- Older-format listings; confirm pad and hose contents when ordering
360mm Monster on 18s: the biggest kit in the range
The 360mm Monster needs 18 inch wheels and is the top of the KA range. Two caliper options: Monster 4 at £1,635.00 inc VAT and Monster 6 at £1,863.00 inc VAT. One thing to read before buying either: the 360mm Monster 4 at £1,635 is listed below the 335mm Monster 4 at £1,650 in price, despite being a larger disc with an 18 inch wheel requirement. This is a pricing anomaly in the HiSpec catalogue. Do not read the price order on this page as a proxy for disc size or kit quality; the compare table below flags it clearly.
For a circuit KA built specifically for track work on 18s, this is where the conversation ends up. Ring us on 0115 9893488 with the wheel spec and what the car does. Cameron handles the clearance side of things; Garreth will talk through Monster 4 against Monster 6 for the specific build. These are older-format HiSpec listings, so confirm contents when ordering.
- Monster 4: £1,635.00 inc VAT price note below
- Monster 6: £1,863.00 inc VAT
- 360mm disc, 18 inch minimum wheel for both
- Monster 4 lists below the 335mm Monster 4 in price; see compare table for the full picture
- Older-format listings; confirm pad and hose contents when ordering
If the car is on 18s
The 360mm Monster is the only kit on this page that needs 18 inch wheels. Both caliper options are below. Note: the Monster 4 at £1,635 lists below the 335mm Monster 4 at £1,650 in price despite being a bigger kit. Read the section above and the compare table before ordering.
What is in each box
There is a split in this catalogue between old-format and new-format HiSpec listings. The two new HISC-series kits, HISC-009 at 278mm and HISC-010 at 300mm single-piece, explicitly exclude pads and braided hoses. You pick the compound when ordering and we add it to the build. HiSpec do this deliberately so you are not paying for a pad grade that does not suit how the car is used.
The remaining six kits are older-format listings. Their descriptions were not complete enough to confirm pad and hose contents at the time of writing this guide. We confirm what is included for those kits before each build goes to HiSpec; the listing text was not complete enough to print a definitive answer here.
Caliper colour is your choice on all eight kits. Black, red, blue, gold and silver are all available. Note your preference at the time of ordering.
| Kit | Caliper | Disc type | Pads | Braided hoses | Caliper colours |
|---|---|---|---|---|---|
| 278mm 1P (HISC-009) | Billet 4, 4 piston | Single-piece | Not included | Not included | Black, red, blue, gold, silver |
| 300mm 1P (HISC-010) | Billet 4, 4 piston | Single-piece | Not included | Not included | Black, red, blue, gold, silver |
| 300mm 2P (older format) | Billet 4, 4 piston | Two-piece floating | Confirm when ordering | Confirm when ordering | Black, red, blue, gold, silver |
| 325mm 2P | Billet 4, 4 piston | Two-piece floating | Confirm when ordering | Confirm when ordering | Black, red, blue, gold, silver |
| 335mm Monster 4 | Monster 4, 4 piston | Two-piece floating | Confirm when ordering | Confirm when ordering | Black, red, blue, gold, silver |
| 335mm Monster 6 | Monster 6, 6 piston | Two-piece floating | Confirm when ordering | Confirm when ordering | Black, red, blue, gold, silver |
| 360mm Monster 4 | Monster 4, 4 piston | Two-piece floating | Confirm when ordering | Confirm when ordering | Black, red, blue, gold, silver |
| 360mm Monster 6 | Monster 6, 6 piston | Two-piece floating | Confirm when ordering | Confirm when ordering | Black, red, blue, gold, silver |
Every kit on this page compared
| Kit | Disc | Caliper | Smallest wheel | Pads and hoses | Price inc VAT |
|---|---|---|---|---|---|
| 278mm Billet 4 1P | 278mm | Billet 4, 4 piston | 15in | Not included | £785.44 |
| 300mm Billet 4 1P | 300mm | Billet 4, 4 piston | 16in | Not included | £817.24 |
| 300mm Billet 4 2P | 300mm | Billet 4, 4 piston | 16in | Confirm | £1,464.00 |
| 325mm Billet 4 2P | 325mm | Billet 4, 4 piston | 17in | Confirm | £1,470.00 |
| 335mm Monster 4 | 335mm | Monster 4, 4 piston | 17in | Confirm | £1,650.00 |
| 335mm Monster 6 | 335mm | Monster 6, 6 piston | 17in | Confirm | £1,773.00 |
| 360mm Monster 4 price anomaly | 360mm | Monster 4, 4 piston | 18in | Confirm | £1,635.00 |
| 360mm Monster 6 | 360mm | Monster 6, 6 piston | 18in | Confirm | £1,863.00 |
Prices include VAT and were correct on 12 September 2026. Note on the 360mm Monster 4: it lists at £1,635.00 inc VAT, which is below the 335mm Monster 4 at £1,650.00, despite being a larger disc with an 18 inch wheel requirement. This is a pricing anomaly in the HiSpec catalogue flagged in our data report. The lower price does not indicate a lower-spec kit.
Common questions
Why does the 360mm Monster 4 cost less than the 335mm Monster 4?
The 360mm Monster 4 lists at £1,635 inc VAT. The 335mm Monster 4 lists at £1,650. Bigger disc, 18 inch wheel requirement, lower price. We have checked this and flagged it with HiSpec. The price order here is not a spec ranking. If you are comparing these two kits and the price is part of the decision, ring us and we will talk through the actual differences.
What is the difference between Monster 4 and Monster 6?
The caliper. Monster 4 is a four-piston caliper; Monster 6 is a six-piston caliper. Same disc size at each level. The six-piston version gives more pad area and a more progressive pedal feel under sustained braking. For a circuit car doing full days, the Monster 6 is worth the extra. For a car that does sprint events or occasional track sessions, the Monster 4 is a well-specced kit for the KA's weight and power range.
What is the difference between a single-piece and a two-piece disc?
A single-piece disc is machined as one part. A two-piece disc separates the hat from the braking ring so the ring can expand thermally without distorting its face. On a road-driven KA or one used on sprints, single-piece is fine. On a car doing repeated high-load circuit sessions, a two-piece disc handles the heat cycling better over a full day. The two-piece kits on this page are all older-format HiSpec listings.
Do I need to buy pads separately?
For the 278mm and 300mm single-piece kits (HISC-009 and HISC-010), yes. Pads and braided hoses are explicitly not included. You tell us the compound when you order and we add it to the build. For the older-format kits at 300mm two-piece, 325mm, 335mm and 360mm, we confirm what is included when you enquire rather than printing assumptions from listing text that was incomplete at time of writing. Ring us before ordering and we will give you a straight answer.
How long does it take to arrive?
HiSpec build each kit to order at their Dartford facility. The standard lead time is up to 28 working days from confirmed order. Current lead times can vary through the year, so ask when you place the order and we will give you the picture at that point.
What we would actually fit
For a KA used on the road and occasional sprint events, the 278mm Billet 4 at £785.44 is worth taking seriously. Four pistons, billet caliper, fits behind 15 inch wheels. Budget for pads and hoses on top, but the total still sits at the lower end of what a four-piston billet conversion costs.
For a car on 17 inch wheels with a real track programme, the 335mm Monster 4 is where Garreth would start the conversation. The jump from Billet 4 to Monster is the meaningful step for a circuit build, and the 335mm clears the same 17in minimum as the 325mm Billet 4. The Monster 6 is worth the extra £123 if the car does serious sustained braking on fast circuits.
Ring us on 0115 9893488 with your wheel size and what the car does. Cameron handles the clearance checks on wheel fitment, so have the make and model of your wheels to hand. Garreth will give you a straight call on which kit earns the money for your specific build.