I was bleeding my front brake yesterday which was mushy and it went from bad to worse. I used Castrol synthetic brake fluid. At first when I pulled the lever fluid would expell from the brake assy bleed valve. But after this happened about six times it stopped passing fulid. During the process I noticed that the master cylinder fluid level never decreased. I ended up taking the line and master cylinder off, and used compressed air to clear what I was hoping was a clog. The air moved through. There are no leaks anywhere in the system. I put the system back together and still no fuild depleation in the master cylinder as I pumped:banghead the lever and no pressure build up despite pumping the lever 100 times and nothing comes out the brake bleed valve. Any ideas? As I write this I was suppose to be riding. Not a great way to start the holiday weekend.