AP Racing Radi-CAL ENP Front Kit 390mm - Camaro, ATS-V, CTS-V

The AP Racing by Essex Radi-CAL Competition Brake Kit with ENP (electroless nickel plated) calipers is a front brake upgrade for the Gen 6 Camaro SS and ZL1 plus Cadillac ATS-V and CTS-V. It pairs AP Racing CP9668 Radi-CAL Pro5000R six-piston calipers with 390 x 34mm, 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 14 lb of unsprung weight from the front of the car compared with the. Each caliper weighs 6.2 lb without pads, against 6.9 lb for the factory cP9668-2S7L/3S7L (six-piston) caliper. The caliper takes a 18mm thick pad for long life and heat tolerance. The ENP (electroless nickel plated) finish is very durable and easy to clean. 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 Camaro, ATS-V, CTS-V, the CP9668 caliper mounts radially on a dedicated bracket at 180mm centers with a 42mm offset, with an M10x1.0 inlet thread. 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. Spiegler stainless steel brake lines with a clear sheath reduce compliance compared with the OEM rubber lines. The caliper uses a commonly available 25mm thick 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.

Features

• AP Racing CP9668 six-piston calipers in ENP finish
• 390 x 34mm, 72-vane J Hook discs on floating hats
• 18mm thick brake pads
• Pistons sized for the OEM master cylinder and ABS
• No caliper removal for pad changes

What's Included

• One pair AP Racing CP9668 Radi-CAL Pro5000R six piston calipers in ENP (Electroless Nickel Plated) finish
• One pair 390x36mm 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

Brake pads are not included.

Specifications

Video

Fitment notes

This front kit fits the vehicles in the table below, which we confirmed against two sources using US model years. Essex has confirmed clearance with Forgeline GS1R 19x11, Forgeline GA1R 19x11, Forgeline VX1R 19x11, Forgeline GT1-5 19x11 and Wheel Fitment Template. Check your wheel with the Essex wheel fitment template before ordering.

Fitment