AP Racing Radi-CAL Competition Front Kit 338mm - Honda S2000 AP2

The AP Racing by Essex Radi-CAL Competition Brake Kit is a front brake upgrade for the 2006-2009 Honda S2000 (AP2). It pairs AP Racing CP9441 Radi-CAL four-piston calipers with 338 x 26mm, 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 11 lb of unsprung weight from the front of the car compared with the OEM brakes. Each caliper weighs 4.8 lb without pads, against 10.3 lb for the factory single-piston sliding caliper. The 16.75mm pad is thicker than the 16mm 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 Honda S2000 AP2, the CP9441 caliper mounts radially on a dedicated bracket at 152mm centers with a 44mm offset, with an M10x1.0 inlet thread. 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. The anodized caliper finish resists wear and deterioration at high temperatures. Stainless steel caliper hardware gives a long service life even with frequent pad changes. There are no dust boots to burn up at track temperatures. Pads change with one bolt, with no caliper removal.

Features

• AP Racing CP9441 four-piston calipers
• 338 x 26mm, 72-vane J Hook discs on floating hats
• About 11 lb less unsprung weight
• 16.75mm thick brake pads
• Pistons sized for the OEM master cylinder and ABS

What's Included

• One pair AP Racing CP9441 Radi-CAL four piston calipers
• One pair 338x26mm, 72 vane heavy duty AP Racing J Hook discs
• One pair Spiegler stainless steel brake lines

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 URGE designed CCW 18x 9.5, 10.5 & 11, 949 Racing 17×9 +48, 949 Racing 17×10 +52, Advan RSII 17×10 +50 (Evasive Spec), Advan RZII 17×10 +50, Advan R SII 17×9.5 + 25, BBS LM 17×9 +42 and Enkei NT03 17×9.5 +44/38. Check your wheel with the Essex wheel fitment template before ordering.

Fitment