AP Racing Radi-CAL Competition Front Kit 372mm - Lancer Evo VIII, IX

The AP Racing by Essex Radi-CAL Competition Brake Kit is a front brake upgrade for the 2003-2006 Mitsubishi Lancer Evolution VIII and IX. It pairs AP Racing CP9660 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.

Why upgrade

The kit removes about 3-4 lb of unsprung weight from the front of the car compared with the OEM brakes, despite considerably larger components. Each caliper weighs 6.2 lb without pads, against 8.2 lb for the factory brembo caliper. Each two-piece disc weighs 19.1 lb, compared with 21.8 lb for the original 320mm disc. The 18mm 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 Lancer Evo VIII, IX, the CP9660 caliper mounts radially on a dedicated bracket at 180mm centers with a 42mm offset, with an M10x1.0 inlet thread. 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. Anti-knockback springs behind the caliper pistons limit pad knockback. The anodized caliper finish resists wear and deterioration at high temperatures.

Features

• AP Racing CP9660 six-piston calipers
• 372 x 34mm, 72-vane J Hook discs on floating hats
• About 3-4 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 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

This front kit fits the vehicles in the table below, which we confirmed against two sources using US model years. Check your wheel with the Essex wheel fitment template before ordering.

Fitment