{"product_id":"2-piece-floating-rear-brake-rotor-upgrade-370mm","title":"2-Piece Floating Rear Brake Rotor Upgrade 370mm","description":"The 034Motorsport 370x22mm 2-Piece Floating Rear Brake Rotor Upgrade is a complete replacement kit designed for B9\/B9.5 Audi A4\/S4, A5\/S5, Q5\/SQ5, and RS4\/RS5 vehicles, working seamlessly with factory rear calipers. This upgrade increases the rotor diameter from 330mm to 370mm, enhancing overall braking performance for street, track, and HDPE driving conditions by keeping brakes cooler and stronger.\n\nEach rotor weighs approximately 15.1lbs, reducing rotational weight by 1.6lbs per corner compared to the factory 16.7lbs rotors. The rotor disc is constructed from a proprietary metal alloy capable of withstanding extreme temperatures, while the central hat is made of 6061-T6 aircraft-grade aluminum with Type III hard anodizing for durability. The J-Slot slotted friction face aids in cleaning the pad surface and managing hot pad outgassing.\n\nFeaturing 36 directionally curved vanes, these rotors forcefully channel cool air through the disc for effective heat dissipation. The 2-piece floating design utilizes high-strength alloy steel bobbins, allowing the rotor and hat to float independently to manage expansion and contraction due to heat, leading to lower long-term maintenance costs as the rotor rings are replaceable. Upsizing the rear rotor repositions the caliper, increasing leverage and enabling the factory caliper to generate more braking force at the rear axle, which balances the braking system, reduces front brake overload, and improves overall stopping confidence and stability.\n\nInstallation Effort is rated as MILD. Please ensure the proper kit is selected for your vehicle, as kits differ between A\/S models and RS4\/RS5 models. The kit includes the 034Motorsport 2-piece floating rear rotor pair and caliper carrier conversion brackets.","brand":"034Motorsport","offers":[{"title":"Default Title","offer_id":52686641234232,"sku":"034-301-2015\/19","price":1128.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/658282577.jpg?v=1784875560","url":"https:\/\/store.motormia.co\/products\/2-piece-floating-rear-brake-rotor-upgrade-370mm","provider":"MOTORMIA","version":"1.0","type":"link"}