Yesterday I set out to change my front brakes. (2006 Road Star 1700 Silverado) When I got to the point of bleeding the lines, I was never able to get enough pressure built up in the master cylinder so that my lever would grab. What the hec?? What am I doing wrong? Also, the black weird little gasket that is in the MC looked all mangled....like it had been exposed to the wrong kind of fluid. I've had the bike about 3 years, just put fluid in not too long ago and everything was fine then. I am wondering, what are the symptoms of a failed Master cylinder?