Not Ranked
I know Don will chime in on the pedal, pushrod, booster relationship since he created the mod so I will go elsewhere. But it does seem as though it could be part of the problem, depending.
Tell me this, when you do push the pedal down to the point you get a firm pedal (and not because it is on the floor!), does the pedal stay there or slowly sink?
If the pedal stays put, I am going to go for bleeding. If it sinks, leak. At least that is where I would start. Of course, if the pushrod being way to short.......
Bleeding a previously open system can be pesky. Every time the line rises and then falls is a great place for the bubble to reside. Did you open the bleeders to far? I see people do it all the time. I open mine only about 1/4 to 1/2 turn. Open them further and you suck air back in around the threads on the pedal return stroke. I don't know how you bled them so you might compare notes with some others around here. With the master cylinder higher than the calipers, they will pretty much self bleed. Pump the peddle slowly by hand.
Rick
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