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

The AP Racing by Essex Radi-CAL Competition Brake Kit is a front brake upgrade for the 2018-2022 Audi TT RS (8S). 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. Clears OE 19 inch and 20 inch wheels without a spacer (see Wheel Fitment & Installation tab for details).

Why upgrade

The kit removes about 26 lb of unsprung weight from the front of the car compared with the OEM TT RS iron brakes. Each caliper weighs 6.2 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 18mm pad is thicker than the 17mm 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 Audi TT RS, the CP9660 caliper mounts radially on a dedicated bracket at 180mm centers with a 42mm offset, with an M10x1.0 inlet thread. 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. 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 two bolts or a quick-change spring clip, with no caliper removal.

Features

• AP Racing CP9660 six-piston calipers
• 372 x 34mm, 72-vane J Hook discs on floating hats
• About 26 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. Essex has confirmed clearance with without, a spacer, OE Audi RS3 8Y 19x9 inch ET25 front wheel, OE Audi TTRS 20 inch front wheel, Neuspeed RSE 102, 19x9 +45mm and TSW Interlagos 18x9 +53. Check your wheel with the Essex wheel fitment template before ordering.

Fitment