Evening, I have a braking issue on a ZX6r, 2008, I'm working on. Wheels were swapped out for same model new wheels and discs, on rebuilding and taking for a test ride the front braked bound on bringing the bike to a virtual standstill. Both calipers have been stripped cleaned and move freely with low air pressure; ran the bike again and the same happened. Master cylinder and all brake lines stripped, cleaned / blown through, took it for a run slightly better until the same occurred after a longer distance, same result though. At a loss as I have never experienced this on any bike previously, the rider has no idea of this was occurring previously. Any suggestions on what to check / do next is appreciated.