Predator Rear Brake Rebuild?

[angelon400ex]

After two years of racing my Predator has required some TLC but after going to the shop and having rear brake pads replaced I need to rebuild or replace the rear master brake cylinder. The brakes are very spongy and after a second are non-existent unless I feather them. Does anyone know of anyone who makes a rebuild kit for the Predator? I have been checking the catalogs and haven't been able to find an application for the Predator. Thanks so much!!!!

[katch26]

i think its possible to replace the master cylinder with one from a different bike like a honda for example. That will help more than anything else.