Received advice for this problem last month, solved it, but am now
experiencing similar problem for entirely different reasons.

Rebuilt the dual circuit MC over the weekend, installed MC and bled
the brakes today with a Power Bleeder.

Something's wrong, the pedal is going almost halfway to the floor
before the braking action begins. Brakes did not behave this way
before I pulled off the MC, they began slowing/ stopping car after
pushing the pedal a few inches. There WAS a fluid leak from front of
MC however, that was main reason I decided to rebuild.

Is there any way to easily determine whether problem is with the
bleed, or with the MC? Pumping pedal makes no difference. There is no
longer a fluid leak out of MC front however.

I'm going to try another bleed tomorrow and see if that helps, but I'd sure like to track down the root of the problem.

Damian

'68 Amazon dual circuit brakes /Girling front discs, Wagner drums rear/ Lockheed booster