AP Racing Radi-CAL Competition Front Kit 355mm - Civic Type R FK8

The AP Racing by Essex Radi-CAL Competition Brake Kit is a front brake upgrade for the 2017-2021 Honda Civic Type R FK8. It pairs AP Racing CP9660 Radi-CAL Pro5000R racing calipers with 355 x 32mm, 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 5 lb of unsprung weight from the front of the car compared with the OEM FK8 brakes. Each caliper weighs 6.2 lb without pads, against 7.85 lb for the factory caliper. Each two-piece disc weighs 17.6 lb, compared with 24.5 lb for the original 350mm disc. The 18mm pad is thicker than the 14.7mm factory pad, so it lasts longer and absorbs more heat between changes. 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.

Caliper and disc construction

On the Civic Type R FK8, the CP9660 caliper mounts radially on a dedicated bracket at 180mm centers with a 42mm offset, with an M10x1.0 inlet thread. Pads change with two bolts or a quick-change spring clip, with no caliper removal. The championship-winning 72-vane AP Racing J Hook discs are fully floating. 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 18mm thick pad shape. Ventilated, domed-back stainless steel pistons keep heat out of the brake fluid for a very firm pedal.

Features

• AP Racing CP9660 six-piston calipers
• 355 x 32mm, 72-vane J Hook discs on floating hats
• About 5 lb less unsprung weight
• 18mm thick brake pads
• Pistons sized for the OEM master cylinder and ABS

What's Included

• One pair AP Racing CP9660 Radi-CAL Pro5000R racing calipers
• One pair 355x32mm 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 without a spacer, APEX SM-10RS: 18x11 inch ET44, 19x10.5 inch ET45, 19x11 inch ET44 and APEX ARC-8: 18x11 inch ET44, 19x11 inch ET43. Check your wheel with the Essex wheel fitment template before ordering.

Fitment