AP Racing PRO 5000R CP9660 + CP9440 Front and Rear CALIPER set suits High Performance /Track /Race Big Brake Kit

Light Weight Race Calipers

2 Pair of AP RACING PRO 5000R Calipers for?Front and Rear 

UK MADE PERFORMANCE RACE CALIPERS 

The AP Racing Pro 5000R is a premier range of radial-mount brake calipers designed specifically for motorsport, utilizing a forged, asymmetrical Radi-CAL™ design to achieve maximum stiffness and minimum weight. 
Key Product Lineup
Model     Type    Approx. Weight    Disc Compatibility    Features
CP9660    6-Piston    2.78 kg    355–380mm    Balanced weight and performance
CP9668    6-Piston    3.10 kg    378–390mm    Supports thick 25mm pads for endurance
CP9440    4-Piston    2.16 kg    315–330mm    Lightweight front option for smaller cars
CP9449    4-Piston    2.20 kg    299–380mm    Compact design, typically used for rear setups
Core Technologies
Radi-CAL™ Concept: An asymmetrical body shape that optimizes material distribution based on dynamic loads during braking, increasing stiffness by over 30% compared to traditional designs.
Two-Piece Forged Body: High-pressure drop-forging provides the strength of billet at a more accessible price point for club racers.
Racing Internals: Features ventilated Stainless Steel Pistons to resist heat transfer and High-Temperature Seals.
Anti-Knockback (AKB) Springs: Standard 4lb springs prevent piston retraction during aggressive cornering, ensuring a consistent and immediate pedal feel. 
Race vs. Street Considerations
No Dust Seals: These calipers lack external rubber dust boots to prevent melting under race temperatures. Consequently, they require more frequent cleaning if used on the road.
Maintenance: AP Racing recommends regular reconditioning and seal replacement, especially if calipers frequently exceed 200°C.
Corrosion Resistance: Most models feature a hard-anodized gray finish, which is highly durable for track use but lacks the aesthetic "show" finish of street-specific kits.