Haven/t suffered this problem yet,but apparently its a common Fazer problem.My old sumitomo's seized badly once but blew out okay,Sounds like a replacement caliper to me.Check this site as i think the Fazer 1000 is a straight swap,but a different type of caliper,therefore less prone to permanent seizure.If the piston is seized flush there is very little you can do.If you can catch a good edge Vise grips may release it,if you twist, but will damage the piston.