{"product_id":"radi-cal-competition-front-brake-kit-372x34mm","title":"Radi-CAL Competition Front Brake Kit 372x34mm","description":"The AP Racing by Essex Radi-CAL Competition Brake Kit is a complete front brake upgrade for the 2009-2016 Audi S4 (B8 and B8.5), engineered for track applications. This kit utilizes AP Racing's patented asymmetrical Radi-CAL caliper design, specifically the CP9660 model, which offers a massive increase in stiffness and a considerable reduction in mass compared to conventional calipers. This translates to superior pedal feel, modulation, more even pad wear, and longer caliper service life, all while optimizing airflow for better heat evacuation.\n\nThis competition-grade system includes 372x34mm, 72-vane AP Racing J Hook discs with floating aluminum hats, Spiegler Stainless Steel Brake Lines with abrasion-resistant coating, and caliper mounting brackets. Despite the substantial increase in disc size, the kit achieves a weight saving of 15 unsprung pounds over the OEM brakes. The stainless steel pistons with domed backs and ventilation provide excellent thermal resistance, preventing brake fluid fade on the track, and anti-knockback springs are included to mitigate pedal drop during aggressive cornering.\n\nBrake pads are not included, allowing users to select their preferred compound from various manufacturers that offer pads in the commonly available shape with 18mm thickness suitable for the CP9660 caliper.","brand":"AP Racing","offers":[{"title":"Default Title","offer_id":52686956331320,"sku":"13.01.10135","price":5549.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/660183389.jpg?v=1784878895","url":"https:\/\/store.motormia.co\/products\/radi-cal-competition-front-brake-kit-372x34mm","provider":"MOTORMIA","version":"1.0","type":"link"}