Somebody please give me some input.
Replaced the 2nd master cylinder today. New seals on the front calipers(didn't need them)new rubber brake hoses,new rotors and pads. Rear brakes appear to be fine. No leaks.Drums and shoes are not new but plenty of lining remaining. 
 The pedal is still very soft and very little change (little) after you pump the pedal 2-3 times.
Checked the brake servo and it passed along with the one way check valve.
I suspect either my brake pressure regulator is failing or I am on my 3rd bad master cylinder. 
HELP !

gatorxray@earthlink.net
Mike