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AP Racing PRO 5000 R CP9450 4-Piston Rear Big Brake Kit | EIAUFA | AME MOTORSPORT
AP Racing CP9450 4-Piston Rear Big Brake Kit AP Racing Pro 5000 R — Radi-CAL™ Forged 2-piece...
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Description
xAP Racing CP9450 4-Piston Rear Big Brake Kit
AP Racing Pro 5000 R — Radi-CAL™ Forged 2-piece
Upgrade your rear braking system with the AP Racing CP9450. This 4-piston forged 2-piece caliper delivers exceptional stopping power with even pad pressure distribution across all pistons, paired with EIAUFA rotors and EIAUFA RT550 performance compound for a complete bolt-on big brake kit solution.
Complete Kit Includes
| Calipers | AP Racing CP9450 — 4-Piston, Forged 2-piece (pair) |
| Brake Discs | EIAUFA 2-piece floating rotors (355x32mm / 378x32mm) |
| Brake Pads | EIAUFA RT550 performance compound |
| Brake Lines | Goodridge stainless steel braided brake lines |
| Mounting Hardware | AME CNC-machined 7075-T6 aluminium bells & vehicle-specific brackets |
Caliper Specifications
| Caliper Model | AP Racing CP9450 |
| Position | Rear |
| Pistons | 4-Piston |
| Total Piston Area | 27.2 cm² |
| Weight (per caliper, no pads) | 2.21 kg |
| Construction | Forged 2-piece |
| Material | Aluminum |
| Finish | - |
| Mounting | Radial |
| Mounting Centers | 152mm |
| Compatible Disc Range | 362-378mm |
Engineering & Technology
The CP9450 Pro 5000 R is a compact 4-piston rear caliper with 27.0/31.8mm differential bore pistons delivering 27.2 cm² at just 2.21 kg. Its 152mm Radi-CAL mounting centres and forged 2-piece construction make it the ideal lightweight rear companion to Pro 5000 R 6-piston fronts.
Performance Upgrade
- Fixed Caliper Design: Eliminates flex and provides consistent pad-to-disc contact across all pistons, unlike factory sliding calipers
- Differential Bore Pistons: Progressively sized pistons distribute clamping force evenly, eliminating tapered pad wear
- Increased Disc Diameter: Larger swept area dramatically improves heat dissipation and braking torque
- Reduced Unsprung Weight: Lightweight aluminum construction improves suspension response and handling
Compatible Pad Compounds
| Use Case | Recommended Compounds |
|---|---|
| Daily Driving | EIAUFA RT550 |
| Spirited Street + Track Days | EIAUFA RT550 |
| Dedicated Track | EIAUFA RS830 |
EIAUFA Disc & Pad Options
Brake Discs:
- EIAUFA GG — 2-piece floating rotor with CNC-machined 7075-T6 aluminium bell (standard)
- EIAUFA HC — High-carbon rotor for improved thermal stability and crack resistance (upgrade)
Brake Pads:
- EIAUFA RT550 — Street/Daily compound
- EIAUFA RT550 — Street/Track compound
- EIAUFA RS830 — Track/Race compound
Custom Brake Solutions
At AME MOTORSPORT, we design and manufacture adapters for virtually every vehicle make and model. All our brake kits are engineered for direct bolt-on fitment across a wide range of vehicles.
- AME CNC-machined 7075-T6 aluminium disc bells & vehicle-specific mounting brackets
- Steel brackets available on request for heavy-duty applications
- Goodridge stainless steel braided brake lines
- All necessary mounting hardware included
Brake discs can be customised with square-slot pattern and full-floating conversion. Please contact us for consultation.
Need a different disc size, pad compound, or custom bracket solution? Contact us to discuss your specific requirements.
Warranty
| Brake Calipers | 1-year warranty against manufacturing defects |
| Brake Discs & Pads | Wear components — not covered under warranty |
| Defect Coverage | Includes cracking, material separation, or other failures without external force. Normal wear and damage from misuse are excluded. |
Lead Time: Approximately 5–14 business days.
Additional Information
xShipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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