AP Racing Radi-CAL Competition Rear Kit 365mm - Shelby GT350

The AP Racing by Essex Radi-CAL Competition Brake Kit is a rear brake upgrade for the 2015-2020 Ford Mustang Shelby GT350 and GT350R. It pairs AP Racing CP9450 Radi-CAL Pro5000R racing calipers with 365 x 30mm, 72-vane AP Racing J Hook discs on fully floating aluminum hats, built for track days and competition driving. Fits inside popular 18 inch track wheels, and OEM 19 inch rear wheel without a spacer.

Why upgrade

The kit removes about 8 lb of unsprung weight from the rear of the car compared with the OEM brakes. Each caliper weighs 4.85 lb without pads, against 5.6 lb for the factory caliper. Each two-piece disc weighs 14.3 lb, compared with 18.8 lb for the original 380mm disc. The caliper takes a 16.75mm thick pad for long life and heat tolerance. Every component is designed to resist the heat of extended track sessions. Pistons are sized to work seamlessly with the OEM master cylinder and ABS.

Caliper and disc construction

On the Shelby GT350, the CP9450 caliper mounts radially on a dedicated bracket at 152mm centers with a 44mm offset, with an M10x1.0 inlet thread. The anodized caliper finish resists wear and deterioration at high temperatures. Stainless steel caliper hardware gives a long service life even with frequent pad changes. There are no dust boots to burn up at track temperatures. Pads change with one bolt, with no caliper removal. The championship-winning 72-vane AP Racing J Hook discs are fully floating. The discs use anti-knockback, anti-rattle attachment hardware. The disc metallurgy is designed for the temperatures seen on track, for a long service life.

Features

• AP Racing CP9450 four-piston calipers
• 365 x 30mm, 72-vane J Hook discs on floating hats
• About 8 lb less unsprung weight
• 16.75mm thick brake pads
• Pistons sized for the OEM master cylinder and ABS

What's Included

• One pair AP Racing CP9450 Radi-CAL Pro5000R racing calipers
• One pair 365x30mm AP Racing CP5775, 72 vane, J Hook racing discs, with fully floating 6061 hard anodized aluminum hats and attachment hardware
• One pair caliper mounting brackets and hardware
• One pair Spiegler Stainless Steel Brake Lines with abrasion resistant coating
• Detailed installation instructions

Brake pads are not included.

Specifications

Video

Fitment notes

This rear kit fits the vehicles in the table below, which we confirmed against two sources using US model years. Essex has confirmed clearance with OEM GT350 aluminum, OEM GT350R carbon and Apex EC7 19x11 +52. Check your wheel with the Essex wheel fitment template before ordering.

Fitment