AP Racing Radi-CAL ENP Front Kit CP9668 372mm - F87 M2, F80 M3, F82 M4

The AP Racing by Essex Radi-CAL Competition Brake Kit with ENP (electroless nickel plated) calipers is a front brake upgrade for BMW F87 M2, M2 Competition, F80 M3 and F82 M4. 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 inside popular 18 inch track wheels.

Why upgrade

The kit removes about 24 lb of unsprung weight from the front of the car compared with the OEM M2 Competition front brake package. Each caliper weighs 6.9 lb without pads, against 10.7 lb for the factory six-piston fixed bridge caliper. Each two-piece disc weighs 21.4 lb, compared with 30.4 lb for the original 400mm disc. The caliper takes a 25mm 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 F87 M2, F80 M3, F82 M4, the CP9668 caliper mounts radially on a dedicated bracket at 180mm centers with a 42mm offset, with an M10x1.0 inlet thread. 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 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.

Features

• AP Racing CP9668 six-piston calipers in ENP finish
• 372 x 34mm, 72-vane J Hook discs on floating hats
• About 24 lb less unsprung weight
• 25mm 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 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 APEX EC7 18x9.5 ET22, APEX EC7 18x10 +33, APEX VS5-RS 18x10 ET25, BBS RIA 18x10 ET25, BC Forged RS43 Monobloc 18x10 ET15, BC Forged RS43 Monobloc 18x10 ET25, Forgeline GSR1 18x9.5 & 19x9.5 ET25 and Forgeline GAR1 18x9.5 & 19x9.5. Check your wheel with the Essex wheel fitment template before ordering.

Fitment