I know you said the brake push rod was properly adjusted, but, just for funzies , back it off a couple of turns and try the test drive again. Don’t ask me how I know.ðŸ›
“Been there, done that, got the T-shirt“ as they say. I will do as you ask. That was my first thought BEFORE I swapped out the old MC and booster for a new one. The reason I wanted a new MC and booster was so I could go back to my factory air intake and filter. My Blazer booster was too big and in the way. I’ve already done this same setup in my 63 and I love it.
