AP Racing Radi-CAL ENP Competition Front Kit 394mm - 991 GT3, GT4 RS

The AP Racing by Essex Radi-CAL ENP Competition Brake Kit is a front iron-disc system for Porsche's naturally aspirated and RS track cars: the 991 GT3, GT3 RS, 911 R and GT2 RS, and the 718 Cayman GT4 RS. It replaces the factory front brakes with CP9669 Radi-CAL six-piston calipers in an electroless nickel plated finish and large 394 x 34mm, 84-vane J Hook discs, giving owners of PCCB or iron-braked cars an iron setup built for constant track use.

Why upgrade

Each CP9669 caliper weighs 6.9 pounds without pads versus 9.3 pounds for the factory unit, and the complete kit saves around 10 pounds of unsprung weight at the front. On PCCB cars it comes within a few pounds of the carbon ceramic system while letting owners preserve those expensive factory components for the street. Piston sizing works with the OEM master cylinder and ABS and the factory rear brakes.

Caliper and disc construction

The CP9669 uses AP Racing's asymmetric Radi-CAL body, shaped by computer modeling so material sits only along the load paths. Its ventilated stainless steel pistons have no ceramic caps to crack, anti-knockback springs keep the pedal firm, and the 25mm (1 inch) thick pad uses a common shape offered by every major pad maker. Pads change without removing the caliper. The jewel-like ENP finish resists wear and staining at elevated temperatures and cleans up easily. The CP4284 discs use 84 directional vanes on 6061 hard anodized aluminum hats with fully floating hardware, and Essex burnishes them before shipping so they arrive ready for the track.

Features

• AP Racing CP9669 Radi-CAL Pro5000R six-piston calipers in ENP finish
• 394 x 34mm, 84-vane J Hook discs on floating aluminum hats
• Around 10 lb lighter than the factory front brakes
• Pad tension clips and disc burnishing included
• Clears the OEM 20 x 9 inch GT3 front wheel
• Works with the factory rear brakes

What's Included

• One pair AP Racing CP9669 Radi-CAL Pro5000R six piston calipers in ENP (Electroless Nickel Plated) finish
• One pair 394x34mm AP Racing CP4284, 84 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
• Pad tension clips and disc burnishing

Brake pads are not included.

Specifications

Video

Fitment notes

Fits the 991 GT cars and 718 Cayman GT4 RS listed below with either factory iron or PCCB front brakes. It clears the OEM 20 x 9 inch GT3 front wheel; confirm aftermarket wheels with the wheel fitment template. The 718 Spyder RS is not listed here while fitment is being confirmed; call us for that car.

Fitment