AP Racing by Essex Radi-CAL Competition Brake Kit (Front CP9668/390mm D62) | S550 S650 Mustang GT & Dark Horse
- Heavy-Duty D62: 390x36mm discs with 72 vanes and 25mm thick pads for maximum heat capacity
- CP9668: 6-piston Radi-CAL at just 6.9 lbs per caliper
- 25 lbs lighter: Massive unsprung weight reduction vs OE
- Fits S550 & S650: Including Dark Horse and GT Performance Pack
AP Racing by Essex
Radi-CAL Heavy-Duty Competition Brake Kit S550 • S650 Dark Horse • GT
D62 heavy-duty configuration with 25mm thick pads for maximum heat capacity and fade resistance on extended track sessions.
Why Choose This Kit
Engineered Without Compromise
Radi-CAL Technology
30%+ stiffer than conventional calipers. Superior pedal feel, even pad wear, and longer service life.
Hard Anodized
Temperature-resistant hard anodized finish built to endure repeated track abuse.
OEM Integration
Works with factory master cylinder, ABS, and stability control. No modifications required.
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 CP9668 Calipers (Pair) 6-piston Radi-CAL Pro5000R with hard anodized finish and ventilated stainless steel pistons
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AP Racing J Hook Racing Discs (Pair) 390x36mm with 72 directional vanes. 2-piece fully floating with 6061 T6 aluminum hats
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Caliper Mounting Brackets & Hardware Precision-machined 6061 T6 billet aluminum, hard anodized, with aircraft-quality hardware
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Spiegler Stainless Steel Brake Lines USA-made with PTFE-Teflon lining, 360-degree torsion fittings, DOT compliant
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Installation Instructions Detailed step-by-step guide for proper fitment
Technical Data
Specifications
Caliper: CP9668
6-Piston Radi-CAL Pro5000RDisc: 390x36mm
J Hook Racing DiscFitment
Compatible Vehicles
Not Included
Brake Pads: Racing pads are a personal choice. Select your preferred Ferodo compound at checkout.
Pad Tension Kit: Available as an optional add-on to eliminate pad rattle.
Important Notes
Application: Designed for track/competition use.
D62 Pads Only: Must use Ferodo D62 pads exclusively. D54/D51 pads will leave unswept disc area.
Professional Installation
Function Factory Performance offers professional installation and track support for your AP Racing brake system.
Ready to Upgrade?
Professional Installation Available
Function Factory Performance offers expert installation and track support for your AP Racing brake system.
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