My riding partner is having a problem with the front brakes on his 1993 CBR900RR. After a few pulls they lock up completely and you have to undo the bleeder valve to unlock them. Once you release the pressure at the caliper they are fine again. We were thinking the master cylinder or calipers so we took and cleaned everything very good. Same Problem. I was just seeing if anyone has any suggestions on what may be wrong or where to get an aftermarket master cylinder....already tried Steeles.