AP Racing CP9448 Front 4-Piston Big Brake Kit
- AP Racing
- Front
- 4-piston
- Track
- Circuit Race Car
We'll confirm the exact color with you before we build the kit.
- Complete AP Racing kit — everything for one axle
- Checked against your car before it ships
- Warranty & returns
- Installation help
- Built to order — ships in about 15 business days
About this kit
A complete front big brake kit for the Subaru BRZ ZC6, Subaru BRZ ZD8, Subaru Crosstrek GU and more. It uses two AP Racing CP9448 4-piston calipers and a pair of rotors (330–355 mm) in high-carbon steel or carbon-ceramic, plus pads, braided lines and mounting hardware.
We match the mounting brackets to your car. You'll need at least 17-inch wheels with enough room for the caliper. Not sure? Send us your wheel details.
You choose the rotor size, rotor material and caliper color. Calipers come in Gray, or in a custom color.
Built to order. It ships in about 15 business days.
Fits these cars
- Subaru BRZ ZC6 Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru BRZ ZD8 Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Crosstrek GU Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Dex Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Exiga Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Forester SF Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Forester SG Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Forester SH Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Forester SJ Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza WRX Hatchback GG Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza WRX Sedan GD Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza WRX Sedan GE Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza WRX Sedan GV Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza WRX Sti Hatchback GR Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza WRX Sti Sedan GD Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza WRX Sti Sedan GE Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza WRX Sti Sedan GV Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza-Hatchback GH Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza-Sedan GC Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza-Sedan GD Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza-Sedan GE Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Impreza-Sedan GM Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Legacy BE Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Legacy BG Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Legacy BL Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Legacy BM Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Legacy BN Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Legacy BS Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Legacy Wagon BH Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Legacy Wagon BP Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Legacy Wagon BR Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Outback BP Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru Outback BR Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Subaru WRX VA Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Toyota 86 ZN6 Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
- Toyota GR 86 ZN8 Recommended rotor size by kit: CP9448 Ø330 × 28 mm (at least 17-inch wheels).
Kits are matched to the cars listed by make, model and years. Wheels, hubs and trim levels can still differ, so check your car and wheels before you order, or ask us.
Car not listed? Ask us →Specifications
| Brand | AP Racing |
|---|---|
| Part type | Big Brake Kit |
| Axle position | Front |
| Piston count | 4 |
| Caliper mounting | Vehicle-specific bracket mount |
| Rotor Material | High-Carbon Steel, Carbon Ceramic |
| Rotor Size | Ø330 × 28 mm, Ø355 × 28 mm |
| Caliper Color | Gray, Custom Color |
| Minimum wheel size | 17" |
| Pad compound (included) | M-05 |
| Caliper material | Forged aluminum alloy |
| Caliper bracket | High carbon steel, CNC-machined |
| Brake lines | Three-layer reinforced construction, PTFE inner liner / SUS304 stainless-steel braid / PVC protective outer sheath |
| Intended use | Track |
| Vehicle class | Circuit Race Car |
| SKU | AP-CP9448-CI-330X28-GRY |
| Lead time (approx.) | 15 business days |
Brake pad compounds
| Compound | Intended use | Rotor | Max temp | Avg μ |
|---|---|---|---|---|
| M-05 · TRACK included | Track — sprint racing, time attack and hard track days | High-Carbon Steel | 750 °C | 0.45 |
| M-05+ · RALLY | Rally and endurance — long sessions and repeated heat cycles | High-Carbon Steel | 700 °C | 0.43 |
| M-03 · CCB+ | Carbon-ceramic rotors only — street and track | Carbon Ceramic | 750 °C | 0.44 |
Pad compound is matched to the rotor material you select. Iron-compatible pads must not be fitted to carbon-ceramic rotors, or the other way round.
What's in the box
- Brake calipers × 2
- Brake pads (one axle set) × 4
- Brake rotors × 2
- Stainless-steel braided brake lines × 2
- Vehicle-specific caliper mounting brackets × 2
- Mounting hardware × 1 set
About the brand
AP Racing
British brake and clutch specialist from Coventry, founded 1968, with one of the longest records in professional motorsport. CP-series calipers are the basis of its road-going big brake kits.
All AP Racing kits →Common questions
Will it fit my wheels?
Big calipers need room inside the wheel. Check the minimum wheel size in the specifications. If you're not sure, send us your wheel make and size and we'll check.
Do I need new brake lines or fluid?
Braided lines come with the kit. You'll need fresh DOT 4 fluid and a full bleed after fitting.
Can I fit it myself?
If you're used to brake work and have a torque wrench, yes. If not, have a workshop fit it. Our installation page covers the basic steps and bed-in.
Similar kits
Not sure what fits?
Send us your car and wheels. We'll tell you what fits.
Year, make, model, wheel size, and whether it's for the street or the track. We reply by email within one business day.