AP Racing Radi-CAL Competition Rear Kit 340mm - BMW E9X M3, 1M

The AP Racing by Essex Radi-CAL Competition Brake Kit is a rear brake upgrade for BMW E90, E92 and E93 M3 and the 1M Coupe. 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 17 lb of unsprung weight from the rear of the car compared with the OEM brakes. Each caliper weighs 4.85 lb without pads, against 8.1 lb for the factory caliper. Each two-piece disc weighs 11.1 lb, compared with 21 lb for the original 350mm disc. The 16.75mm pad is thicker than the 16.1mm 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 BMW E9X M3, 1M, the CP9449 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 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 BMW OEM ZCP 359M 19 x 10 inch ET25, BMW OEM 220M 19 x 9.5 inch ET23, OZ Challenge HLT 18 x 10 inch ET25, Volk Racing TE37SL 18 x 10.5 inch ET20, Signature, Wheel SV503 18” x 11” ET29 and Wheel SV501 18” x 10.5” ET40. Check your wheel with the Essex wheel fitment template before ordering.

Fitment