AP Racing Radi-CAL ENP Competition Front Kit 372mm - Audi TT RS

The AP Racing by Essex Radi-CAL Competition Brake Kit with ENP (electroless nickel plated) calipers is a front brake upgrade for the 2018-2022 Audi TT RS (8S). It pairs AP Racing CP9668 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. Clears OE Audi RS3 8Y 19x9 inch ET25 front wheel.

Why upgrade

The kit removes about 24 lb of unsprung weight from the front of the car compared with the OEM iron brakes. Each caliper weighs 6.9 lb without pads, against 10.75 lb for the factory 8 piston caliper. Each two-piece disc weighs 20.6 lb, compared with 29.6 lb Iron 12.45 lb Carbon Ceramic for the original 370mm disc. The 25mm pad is thicker than the 17mm factory pad, so it lasts longer and absorbs more heat between changes. The ENP (electroless nickel plated) finish is very durable and easy to clean. 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 Audi TT RS, the CP9668 caliper mounts radially on a dedicated bracket at 180mm centers with a 42mm offset, with an M10x1.0 inlet thread. 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 electroless nickel plated finish resists wear and deterioration, even at high temperatures. The caliper uses a commonly available 25mm 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. Stainless steel caliper hardware gives a long service life even with frequent pad changes.

Features

• AP Racing CP9668 six-piston calipers in ENP finish
• 372 x 34mm, 72-vane J Hook discs on floating hats
• 25mm thick brake pads
• Pistons sized for the OEM master cylinder and ABS
• No caliper removal for pad changes

What's Included

• One pair AP Racing CP9668 Radi-CAL Pro5000R six piston calipers in ENP Finish (Electroless Nickel Plated)
• One pair 372x34mm 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

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 OE Audi RS3 8Y 19x9 inch ET25 front wheel. Check your wheel with the Essex wheel fitment template before ordering.

Fitment