JApache That master cylinder should squirt out a powerful stream of fluid,get it in your vice with a line going right back into it. Get it to recirculate there,put it on the truck engine not running. I then put aclear hose on a drilled thru bleeder bring it around the truck and let it squirt into the master cylinder. You can clear the air out then !! Not much mess or loss that way. You can see what your getting,if dirty let it go on the ground and add more. then follow shop manuel directions engine off for all of that.