I don't know if that will work or not, and yes I have the drums on all 4. I did think of something, though. While reading some posts about spongy brakes I think I remember something where the port that is squirting fluid out on mine is supposed to be covered by the plunger initially. Mine is a few mm's from covering it to begin with. If I get the cab on and adjust the pedal so that it starts in this position, would it make a difference?