AP Racing by Essex Radi-CAL ENP 2012-2025 McLaren 720S 650S 600LT MP4-12C Competition Brake Kit (Rear CP9449/380mm)
- Track-Ready: Complete rear ENP brake kit for extended track sessions
- Lightweight: Within 2 lbs per side of OEM carbon ceramic
- ENP Finish: Jewel-like Electroless Nickel Plated caliper – durable and easy to clean
- Parking Brake: Retains OEM parking brake functionality
- Radi-CAL Technology: CP9449 4-piston caliper weighs only 4.85 lbs
- 72-Vane Discs: 380x32mm fully floating J Hook racing discs
- OEM Integration: Fits OEM wheels without spacer
- Included: Pad tension kit and disc burnishing at no additional cost
AP Racing by Essex Radi-CAL ENP 2012-2025 McLaren 720S 650S 600LT MP4-12C Competition Brake Kit (Rear CP9449/380mm)
AP Racing by Essex
Radi-CAL ENP Rear Brake Kit McLaren 720S · 650S · 600LT · MP4-12C
Complete the track package with rear brakes engineered for extended sessions. Ultra-lightweight 4-piston Radi-CAL calipers paired with 72-vane floating discs.
Complete Your Setup
Rear Brakes Built for Balance
Designed to work seamlessly with our front Essex/AP Racing Radi-CAL Competition Brake Kit, this rear system maintains proper brake bias while delivering the same championship-proven technology to all four corners.
Weighing within 2 lbs per side of the OEM carbon ceramic system, the CP9449 4-piston calipers deliver exceptional pedal feel and modulation with none of the CCM replacement anxiety.
Retains full OEM parking brake functionality — no modifications required for 720S, 650S, and 600LT models.
Why Choose This Kit
Rear-Specific Engineering
Purpose-built for the demands of rear axle braking on mid-engine supercars
CCM Alternative
Within 2 lbs per side of OEM carbon ceramic — track-ready without the $8K+ replacement cost
ENP Finish
Electroless nickel plating won't chip, flake, or fade at track temps. Same finish used on F-15 jets.
Ultra-Light Caliper
4.85 lbs — lighter than OEM's 7.23 lb rear caliper despite being a full racing unit
Parking Brake Retained
Full OEM parking brake functionality on 720S, 650S, 600LT. MP4-12C iron brake models need bracket.
Pre-Burnished
Discs arrive burnished in Ferodo compound — install and drive hard immediately. No bed-in hassle.
Pad Options
FRP216 pad shape available from every major manufacturer. Never stuck without pads.
Quick Pad Change
Bridge bolt pops out with a 6mm hex. Change pads faster than you can remove the wheel.
Lifetime Support
Essex is AP Racing's official rebuild center. Professional reconditioning available for the life of your kit.
Complete Kit
What's In The Box
-
AP Racing CP9449 Radi-CAL Pro5000R Calipers (Pair) 4-piston, 4.85 lbs each — ENP finish with ventilated stainless steel pistons and anti-knockback springs
-
AP Racing CP5772 J Hook Racing Discs (Pair) 380x32mm with 72 directional vanes — 2-piece fully floating design with 6061 T6 hard anodized aluminum hats
-
Professional Disc Burnishing Included Discs arrive pre-burnished in Ferodo Racing compound — ready to install and drive hard immediately
-
Caliper Mounting Brackets & Hardware Precision machined 6061 T6 aluminum with aircraft-quality hardware
-
Essex Pad Tension Kit Billet aluminum blocks with stainless steel springs — eliminates brake noise
-
Detailed Installation Instructions Step-by-step guide for proper fitment
Technical Data
Rear Kit Specifications
Rear Kit (CP9449/380mm)
4-Piston Radi-CAL Pro5000REngineering
Radi-CAL Technology
CP9449 Pro5000R Architecture
The asymmetric Radi-CAL design distributes mass along diagonal load paths, providing 30%+ greater stiffness than conventional calipers while reducing weight.
Drop-forged 2-piece construction brings F1-derived technology to enthusiasts at an accessible price point.
Ventilated Stainless Steel
Machined stainless steel pistons with domed backs provide exceptional stiffness and heat resistance. Ventilation gaps promote cooling airflow around the pistons.
Anti-knockback springs maintain piston position through corners, eliminating the pedal drop common with fixed calipers.
72-Vane J Hook Racing Disc
AP Racing's J Hook slot pattern creates even heat distribution across the disc face, reducing stress risers and cracking while providing superior pad bite.
Fully floating 2-piece design with 6061 T6 aluminum hats accommodates thermal expansion without coning or distortion.
Electroless Nickel Plating
ENP finish is extremely hard and resistant to wear, corrosion, and brake fluid. Used on F-15 targeting pods and hard disc drives for its durability.
Won't chip, flake, or change color at track temperatures like paint or powder coat finishes.
How It Compares
Rear Kit vs. OEM
| Specification | Essex/AP Racing Rear BBK | McLaren 720S OEM CCM Rear |
|---|---|---|
| Caliper Weight | 4.85 lbs 33% Lighter | 7.23 lbs |
| Disc Weight | 17.0 lbs | 12.2 lbs (CCM) |
| Disc Diameter | 380mm | 380mm |
| Disc Thickness | 32mm | 34mm |
| Internal Vanes | 72 Directional Superior Cooling | N/A (CCM) |
| Replacement Disc Cost | ~$350-400/ring 90% Less | $4,000-6,000+/disc |
| Pad Options | All Major Brands More Choice | CCM-Specific Only |
| Parking Brake | Full OEM Function Retained | OEM Function |
Fitment
Compatible Vehicles
Wheel Fitment
Confirmed Wheels & Downloads
Gallery
Product Images
Not Included
Brake Pads: Racing pads are a personal choice. Select your preferred Ferodo compound at checkout — DS2500, DS1.11, DSUNO, or DS3.12.
Brake Lines: OEM brake lines are retained and work perfectly with this kit.
Important Notes
Application: Designed for track/competition use. Off-road use only.
MP4-12C: Models with factory iron brakes require the Essex parking brake relocation bracket (sold separately).
Professional Installation
Function Factory Performance is a certified Thorney Motorsport Independent Specialist for McLaren on the West Coast.
We offer professional installation, track support, and ongoing service for your AP Racing brake system.
You May Also Need
Related Products
Ready to Upgrade?
Professional Installation Available
As a certified Thorney Motorsport Independent Specialist, Function Factory Performance offers expert installation and track support for your AP Racing brake system.
Related products
Available
$1.00
Available
$1,899.98
Price range: $2,099.00 through $2,158.00
Available
$11,000.00
FREQUENTLY ASKED QUESTIONS
If it's in stock and ready to roll, your order usually hits the road within 1–3 business days.
For made-to-order or specialty items (like carbon fiber parts or custom builds), the turnaround can take up to 8 weeks — perfection takes time.
Either way, we'll keep you updated so you know exactly when your parts are leaving the pit lane.
Absolutely! Once your order ships, you'll receive an email with a tracking link so you can follow its journey from our shop to your doorstep.
If your order ships via freight, you'll get a separate email with a direct link to the carrier's tracking page — easy and stress-free.
Things happen on the road — even to boxes. If your order arrives damaged, snap a few clear photos of the box and product and send them our way right away.
If your shipment is lost, just email or call us — we'll help track it down and guide you through the next steps to make it right.
Simple — spread the horsepower! Follow us on Instagram, YouTube, and Facebook, and most importantly, drop us a review on Google or Yelp to let others know about your experience.
Your feedback helps us grow, create more content, and keep bringing performance-driven parts to the community. 🏁
1ST CLASS SERVICE
805-267-9762or email Support@FFPerformance.co
Car parts can be a maze — good thing we brought the map. Our team's here to keep things smooth, simple, and maybe even a little fun.
📞 Click To Call Now
Reviews
There are no reviews yet