Hey, I'm thinking there is something broken either gsxr or banshee master cylinder, so i looked up on ebay and saw this REAR BRAKE MASTER CYLINDER REBUILD
BANSHEE 87-01 REAR BRAKE MASTER CYLINDER REBUILD KIT: eBay Motors (item 140363307919 end time May-26-10 14:22:46 PDT)
could be something broken inside master cylinder or it could be the gsxr broken, i'm just trying to throw in some ideas and trying figure out what can be wrong,