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

The AP Racing by Essex Radi-CAL Competition Brake Kit with ENP (electroless nickel plated) calipers is a front brake upgrade for BMW E90, E92 and E93 M3 and the 1M Coupe. It pairs AP Racing CP9668 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 behind several popular 18 inch aftermarket wheel options.

Why upgrade

The kit removes about 12 lb of unsprung weight from the front of the car compared with the OEM brakes. Each caliper weighs 6.9 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. The ENP (electroless nickel plated) finish is very durable and easy to clean. 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 CP9668 caliper mounts radially on a dedicated bracket at 180mm centers with a 42mm 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 electroless nickel plated finish resists wear and deterioration, even at high temperatures. The caliper uses a commonly available 25mm thick 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. 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 CP9668 six-piston calipers in ENP finish
• 372 x 34mm, 72-vane J Hook discs on floating hats
• About 12 lb less unsprung weight
• 18mm thick brake pads
• Pistons sized for the OEM master cylinder and ABS

What's Included

• One pair AP Racing CP9668 Radi-CAL Pro5000R six piston calipers in ENP (Electroless Nickel Plated) finish
• One pair 372x34mm AP Racing 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 Apex ARC-8 18 x 10 inch & 19x10 inch +25, APEX EC-7 18 x 9.5 inch +22, APEX EC-7 18 x 10 inch & 19x10 inch +25, APEX EC-7RS 19 x 10 inch +25, APEX FL-5 18 x 10 inch +25, APEX SM-10 18 x 10 inch & 19x10 inch +25, APEX VS-5RS 18 x 10 inch & 19x10 inch +25 and BBS FI 18 x 9.5 inch +22. Check your wheel with the Essex wheel fitment template before ordering.

Fitment