Prospeed is the maker of Prospeed RS683 Xtreme Performance Brake Fluid. Prospeed RS683™ is the ONLY racing/high performance brake fluid developed and manufactured in the USA! Prospeed RS683 is a top quality product that is used by many professional racers including Robb Holland, who won at the Nurburgring on April 27th in the VLN class in an Audi TT RS. Additionally, David Zylberberg, a professional motorcycle racer, is also a user of the product. He won several races in 2011, but missed most of 2012 due to injuries and is back for the 2013 season. Prospeed RS683 provides excellent pedal feel and according to many racers who use it, an unparalleled "hard pedal all day" experience.