Clutch Problems

[Maddog]

I just converted my 190e to a manual and I am having some trouble getting the clutch to work. When I push my clutch in, it stays in. It feels firm about 75% of the way and than the spring pulls the petal to the floor past that. If I don't go past that point though, the petal will operate normally and come back out. I reverse bled the system using the front brake caliper and thought that I did a pretty good job. Could I still have air in the system or is it more likely that master cylinder is broken? I had to replace the slave cylinder because it was rusted out and I am worried that the master cylinder might be in equally bad condition.

Can anyone give me input on this or maybe give me some tricks for reverse bleeding?