AP Racing Radi-CAL Competition Front Kit 9660 - F87 M2, F80 M3, F82 M4

The AP Racing by Essex Radi-CAL Competition Brake Kit is a complete front big brake system for the BMW F87 M2, M2 Competition and M2 CS, the F80 M3 and the F82 M4. It replaces the factory front calipers and discs with AP Racing CP9660 Radi-CAL Pro5000R six-piston calipers and 372 x 34mm two-piece J Hook discs, built for drivers who spend real time on track and want a pedal that stays consistent from the first lap to the last.

Why upgrade

Against the factory M2 Competition front brakes, this kit removes about 26 pounds of unsprung weight from the nose, and roughly 10 pounds compared with the standard iron M brake package. Less weight at each corner sharpens steering response and helps the dampers keep the tires planted over curbs. The kit changes front brake torque only modestly, so the shift in brake bias is typically in the 2-3% range and ABS and stability systems behave as before, while thermal capacity rises sharply. The kit pairs with the factory rear brakes or a matching AP Racing rear kit.

Caliper and disc construction

Radi-CAL is AP Racing's asymmetric caliper design, developed with computer modeling to put material only where the loads travel. The result is a stiff, light caliper (6.2 pounds each without pads) with a hard anodized finish that will not chip or flake the way paint does at track temperatures. Stainless pistons limit heat flow into the fluid, anti-knockback springs keep the pedal firm after hard cornering, and high-temperature, low-drag seals extend service life. There are no dust boots to burn, and pads change with one bolt without removing the caliper. The CP7177 discs use 72 vanes, 6061 hard anodized aluminum hats and fully floating attachment hardware.

Features

• AP Racing CP9660 Radi-CAL Pro5000R six-piston calipers
• 372 x 34mm, 72-vane AP Racing J Hook discs on floating aluminum hats
• About 26 lb lighter than the M2 Competition front brakes
• Clears 19 inch OEM wheels without a spacer, plus many aftermarket 18 inch wheels
• Small, predictable change in brake bias with no noticeable effect on ABS
• Replacement 372x34mm J Hook disc rings available
• Brake pads can be added as an option at checkout

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

Fits the cars below with either the factory iron or carbon ceramic front brakes. Clears 19 inch OEM wheels without a spacer, as well as many aftermarket 18 inch wheels; check aftermarket wheels with the wheel fitment template before ordering. F83 M4 Convertible and G8x models are not covered by this kit.

Fitment