AP Racing Radi-CAL ENP Competition Rear Kit 365mm - Porsche 997, 991

The AP Racing by Essex Radi-CAL Competition Brake Kit with ENP (electroless nickel plated) calipers is a rear brake upgrade for the Porsche 997 and 991 911. It pairs AP Racing CP9449 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.

Why upgrade

The kit removes about 9 lb of unsprung weight from the rear of the car compared with the OEM 997.2 GT3 iron brakes despite larger discs, and 4 lbs. vs. the 997 S/GTS and 991.2 Base/T. Each caliper weighs 4.85 lb without pads, against 7.0 lb for the factory porsche 991.2 Base/T caliper. Each two-piece disc weighs 19.0 lb with hat, compared with 20.0 lb for the original 330mm disc. The caliper takes a 16.75mm thick pad for long life and heat tolerance. The ENP (electroless nickel plated) finish is very durable and easy to clean. The OEM parking brake keeps working. The caliper takes pads from all major pad manufacturers. 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 Porsche 997, 991, the CP9449 caliper mounts radially on a dedicated bracket at 152mm centers with a 44mm offset, with an M10x1.0 inlet thread. Spiegler stainless steel brake lines with a clear sheath reduce compliance compared with the OEM rubber lines. The caliper uses a commonly available pad shape. Ventilated, domed-back stainless steel pistons keep heat out of the brake fluid for a very firm pedal. Anti-knockback springs behind the caliper pistons limit pad knockback. 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. The championship-winning 72-vane AP Racing J Hook discs are fully floating.

Features

• AP Racing CP9449 0-piston calipers in ENP finish
• 365 x 30mm, 72-vane J Hook discs on floating hats
• About 9 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 CP9449 Radi-CAL Pro5000R racing calipers in ENP (Electroless Nickel Plated) finish
• One pair 365x30mm AP Racing 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 Wheel Fitment Template. Call us about the Porsche 911 Carrera T before ordering; we have not confirmed fitment for them yet. Check your wheel with the Essex wheel fitment template before ordering.

Fitment