AP Racing Radi-CAL Competition Front Kit 372mm - BMW E9X M3, 1M

The AP Racing by Essex Radi-CAL Competition Brake Kit is a front brake upgrade for BMW E90, E92 and E93 M3 and the 1M Coupe. It pairs AP Racing CP9660 Radi-CAL Pro5000R six-piston calipers with 372 x 34mm, 72-vane AP Racing J Hook discs on fully floating aluminum hats, built for track days and competition driving. Fits several variants of OEM 18 inch and 19 inch wheels without a spacer, and many aftermarket 18's.

Why upgrade

The kit removes about 14 lb of unsprung weight from the front of the car compared with the OEM brakes. Each caliper weighs 6.2 lb without pads, against 13 lb for the factory caliper. Each two-piece disc weighs 19.1 lb, compared with 22.5 lb for the original 360mm disc. The caliper takes a 18mm thick pad for long life and heat tolerance. 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. It works with the OEM rear brakes or a matching AP Racing rear kit.

Caliper and disc construction

On the BMW E9X M3, 1M, the CP9660 caliper mounts radially on a dedicated bracket at 180mm centers with a 42mm offset, with an M10x1.0 inlet thread. 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. Pads change with two bolts or a quick-change spring clip, with no caliper removal. The championship-winning 72-vane AP Racing J Hook discs are fully floating.

Features

• AP Racing CP9660 six-piston calipers
• 372 x 34mm, 72-vane J Hook discs on floating hats
• About 14 lb less unsprung weight
• 18mm thick brake pads
• Pistons sized for the OEM master cylinder and ABS

What's Included

• One pair AP Racing CP9660 Radi-CAL Pro5000R six piston calipers
• One pair 372x34mm AP Racing CP7177, 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 front 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 18 inch Wheels, BMW OEM ZCP 359M 19 x 9 inch ET31, BMW OEM 220M 19 x 8.5 inch ET29, APEX ARC-8 18 x 10 inch ET25, APEX EC-7 18 x 9.5 inch ET22, APEX EC-7 18 x 10 inch ET25, BBS FI 18 x 9.5 inch ET22 and Enkei NT03+M 18 x 10 inch ET25. Check your wheel with the Essex wheel fitment template before ordering.

Fitment