DavidK
I have not warmed completely before driving. It is the same situation every time I test it. Booster is fine, brakes fine then a couple miles up the road it acts up again. Once it starts, I will get intermittent “good” braking on the way home. Meaning, no hard pedal, no brake light, and working brakes.
Just pulled the proportioning valve off and it is centered so I think I can reduce that one.
After sitting for a week, I pulled the check valve and booster is still holding vacuum.
Could it be trapped air?? I’ve bled the crap out of them but have head that power bleeding is the only way to get it all out.