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

The AP Racing by Essex Radi-CAL Competition Brake Kit is a rear brake system for BMW's F-series M cars: the 2016-2018 F87 M2, the F80 M3 and the F82 M4. It uses AP Racing CP9449 Radi-CAL four-piston calipers with 365 x 30mm, 72-vane J Hook discs and keeps the factory parking brake fully functional.

Why upgrade

The factory rear brakes on these cars use a dual-cast disc that is only 24mm thick and weighs 20.0 pounds. This kit replaces it with a 30mm thick floating disc that weighs 14.3 pounds, and each fixed four-piston caliper weighs 4.85 pounds against 6.2 for the factory unit. Together that saves about 10 pounds of unsprung weight while adding heat capacity, which matters when a front big brake kit has moved more of the work to the rear. Pistons are sized for the OEM master cylinder and ABS.

Caliper and disc construction

The CP9449 is a radial-mount Radi-CAL caliper with an asymmetric, hard anodized body. Stainless pistons, anti-knockback springs and low-drag seals hold up to sustained track heat. The CP5775 discs ride on 6061 hard anodized aluminum hats with fully floating hardware. It is designed to work with the AP Racing front kits for these cars.

Features

• AP Racing CP9449 Radi-CAL four-piston rear calipers
• 365 x 30mm, 72-vane J Hook discs on floating hats
• About 10 lb lighter than the OEM rear brakes
• Retains the OEM parking brake
• Pairs with AP Racing M2, M3 and M4 front kits

What's Included

• One pair AP Racing CP9449 Radi-CAL Pro5000R racing calipers
• One pair 365x30mm 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

Fits the BMW M models below. The M2 is covered for 2016-2018 only; call us about the M2 Competition and CS. Clears BBS E88 18 x 11, BBS RE 18 x 10.5 +33, BBS RIA 18 x 10 +37, Forgeline GSR1 19 x 10.5 +40 and Klassen M52R 18 x 10.5 ET34 wheels without a spacer.

Fitment