I started bleeding my brakes since the fluid in there was NASTY. I bled the front brakes following the manual with no problems. Then I got to the rear brake. Doing the same thing I did with the front I noticed that I was draining fluid but not replacing it from the the reservoir. Well I ended up drained all the fluid from the rear master cylinder and now I get nothing. The line coming from the front of the bike to the rear cylinder is rock hard. But from the rear brake lever to the rear brake is empty. Did I do something wrong? Should I maybe take apart the rear cylinder and and check it? Any ideas?