AP Racing Radi-CAL Rear Kit 380mm - McLaren 720S, 650S, 12C

The AP Racing by Essex Radi-CAL Competition Brake Kit is a rear brake upgrade for the McLaren MP4-12C, 650S and 720S. It pairs AP Racing CP9449 Radi-CAL Pro5000R racing calipers with 380 x 32mm, 72-vane AP Racing J Hook discs on fully floating aluminum hats, built for track days and competition driving. Fits OEM wheels without spacer.

Why upgrade

Weighs within 2 lb per side of the OEM carbon ceramic brake system. Each caliper weighs 4.85 lb without pads, against 7.23 lb for the factory caliper. The caliper takes a 16.75mm thick pad for long life and heat tolerance. 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 McLaren 720S, 650S, 12C, the CP9449 caliper mounts radially on a dedicated bracket at 152mm centers with a 44mm offset, with an M10x1.0 inlet thread. The disc metallurgy is designed for the temperatures seen on track, for a long service life. 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 CP9449 0-piston calipers
• 380 x 32mm, 72-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 caliper mounting brackets and hardware
• 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 Forgeline GA1R 19x11 & 19x12, Forgeline GS1R 19x11 & 19x12, Forgeline GT1-5 19x11 & 19x12 and Forgeline VX1R 19x11 & 19x12. Call us about the McLaren 570S and McLaren 600LT before ordering; we have not confirmed fitment for them yet. Check your wheel with the Essex wheel fitment template before ordering.

Fitment