Originally Posted by montecarlo31
Vac leak or pressure issue somewhere, my chevy 1500 does it, i've learned to live with it because it's out of warranty, does this occure after a low vac situation? If it were under warranty i'd take it back, could be a leak somewhere.
Yeah I am taking it in Friday. I know some F-150 owners complain of this and have had success with having the actuator rod between master cylinder and booster adjusted.
I happens most of the time. One pump and it is rock solid.