67 Dart brake change

72bluNblu, pettybludart, lhearold, cosgig, 69DartGTS, thanks for the help. The pedal when pumped in succession, holds most of the time, but maybe every third or 4th pump goes to the floor. With the pedal going to the floor, I would expect to see some fluid accumulating somewhere on the ground, but I don't see it happening. That makes me think it's the master cylinder. I don't know how old the MS is. Back in the day, I seem to remember that if there was air in the lines from the MS it tends to clear it self as the air rises and is replaced by the fluid from the MS. And the car is a jigsaw puzzle of parts, so I just want to get it right. The car might be in a movie, so I want it to be able to stop & go. Thanks guys. Chaz.