AP Racing Radi-CAL Competition Rear Kit 340mm - C6 Corvette

The AP Racing by Essex Radi-CAL Competition Brake Kit is a rear brake upgrade for every 2005-2013 C6 Corvette. It pairs AP Racing CP9449 Radi-CAL Pro5000R racing calipers with 340 x 28mm, 48-vane AP Racing J Hook discs on fully floating aluminum hats, built for track days and competition driving.

Why upgrade

The kit removes about 12 lb of unsprung weight from the rear of the car compared with base the OEM rear brakes. Our kit drops 12 unsprung lbs. from C6 Z51, and 20 unsprung lbs. from C6 Z06 the OEM rear. Each caliper weighs 4.85 lb without pads, against 6.4 lb for the factory caliper. Each two-piece disc weighs 11.1 lb, compared with 14.2 lb for the original 305mm disc. The 16.75mm pad is thicker than the 16.3mm 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 C6 Corvette, the CP9449 caliper mounts radially on a dedicated bracket at 152mm centers with a 44mm offset, with an M10x1.0 inlet thread. There are no dust boots to burn up at track temperatures. Pads change with one bolt, with no caliper removal. The championship-winning 48-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 pad shape.

Features

• AP Racing CP9449 0-piston calipers
• 340 x 28mm, 48-vane J Hook discs on floating hats
• 16.75mm 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 CP9449 Radi-CAL Pro5000R racing calipers
• One pair 340x28mm AP Racing CP6565 heavy duty 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 rear C5 Z06 18 inch and OEM rear C6 Z06 19 inch. Check your wheel with the Essex wheel fitment template before ordering.

Fitment