These Balanced Brake Upgrades® put StopTech on the enthusiast map. They maintain factory bias while providing shorter stopping distances, better modulation and less brake fade. They include stiffer StopTech calipers, larger-than-stock 2-pc StopTech AeroRotors, StopTech Street Performance Pads and StopTech Stainless Steel Lines. Feature fully forged calipers with patented stiffening bridges, patented 2-piece AeroRotors for optimized cooling, braided stainless steel brake lines, performance brake pads, mounting brackets & all necessary hardware to complete install. Feature fully forged calipers with patented stiffening bridges; patented 2-piece AeroRotors for optimized cooling; braided stainless steel brake lines; performance brake pads; mounting brackets/all necessary hardware to complete install. 2014 - 2015 BMW M3, 2015 - 2015 BMW M4