AP Racing Radi-CAL ENP Rear Kit 365mm - F87 M2, F80 M3, F82 M4

The AP Racing by Essex Radi-CAL Competition Brake Kit with ENP (electroless nickel plated) calipers is a rear brake upgrade for BMW F87 M2, F80 M3 and F82 M4. It pairs AP Racing One pair ENP Finish (Electroless Nickel Plated) AP Racing CP9449 Radi-CAL Pro5000R racing calipers with 365 x 30mm, 72-vane AP Racing J Hook discs on fully floating aluminum hats, built for track days and competition driving.

Why upgrade

The kit removes about 10 lb of unsprung weight from the rear of the car compared with the OEM brakes. Each caliper weighs 4.85 lb without pads, against 6.2 lb for the factory 2 piston opposed caliper. Each two-piece disc weighs 14.3 lb, compared with 20.0 lb for the original 370mm disc. The caliper takes a 16.75mm thick pad for long life and heat tolerance. The ENP (electroless nickel plated) finish is very durable and easy to clean. 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 F87 M2, F80 M3, F82 M4, the CP9449 caliper mounts radially on a dedicated bracket at 152mm centers with a 44mm offset, with an M10x1.0 inlet thread. 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. 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.

Features

• AP Racing CP9449 0-piston calipers in ENP finish
• 365 x 30mm, 72-vane J Hook discs on floating hats
• About 10 lb less unsprung weight
• 16.75mm thick brake pads
• Pistons sized for the OEM master cylinder and ABS

What's Included

• One pair ENP Finish (Electroless Nickel Plated) AP Racing CP9449 Radi-CAL Pro5000R racing calipers
• One pair 365x30mm AP Racing CP8972, 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 rear kit fits the vehicles in the table below, which we confirmed against two sources using US model years. Essex has confirmed clearance with BBS E88 18x11, BBS RE 18x10.5 +33, BBS RIA 18x10 +37, Forgeline GSR1 19x10.5 +40 and Klassen M52R 18x10.5 ET+34 5x120, 72.56CB. Check your wheel with the Essex wheel fitment template before ordering.

Fitment