AP Racing Radi-CAL Competition Rear Kit 365mm - Gen 6 Camaro SS, ZL1

The AP Racing by Essex Radi-CAL Competition Brake Kit is a rear brake upgrade for the 2016-2024 sixth generation Camaro SS and ZL1. 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 6 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 four-piston opposed caliper. Each two-piece disc weighs 16.7 lb, compared with 19.5 lb for the original disc. The 16.75mm pad is thicker than the 15mm factory pad, so it lasts longer and absorbs more heat between changes. The OEM parking brake keeps working. 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 Gen 6 Camaro SS, ZL1, the CP9450 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. 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.

Features

• AP Racing CP9450 0-piston calipers
• 365 x 30mm, 72-vane J Hook discs on floating hats
• About 6 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
• One pair 365x30mm AP Racing CP8972, 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 20 inch rear wheel from 1LE package, APEX ARC-8 19x10 inch ET20, APEX ARC-8 19x10.5 inch ET35, APEX ARC-8 19x11 inch ET41, APEX ARC-8 19x12 inch ET41, APEX SM-10 18x10 inch ET19, APEX SM-10 18x11 inch ET35 and APEX SM-10 18x12 inch ET41. Call us about the Cadillac ATS-V and Cadillac CTS-V before ordering; we have not confirmed fitment for them yet. Check your wheel with the Essex wheel fitment template before ordering.

Fitment