I seem to get- consistently get air in my front brake lines..?? Gravity bleed the front and the pedal comes back up... Fine for a couple of drives and then let it set for a little bit and mushy pedal again...
The proportioning valve is the obvious first culprit as I always seem to have a drip of fluid hanging off of it...
With what happened to me with a customer's car yesterday I have suspicions about the master cylinder as well... ??..