I will check out the caliper and hose.
when the new booster and master cylinder arrived it was assembled as a unit. I did remove the master cylinder so the booster could be painted. I ran the car a half dozen times with the rod hanging out of the booster. I hope I got it right when I reassembled it.
I believe the end of the pushrod fits into a 'square cut ' o-ring in the back of the master cylinder piston, which grabs and holds the end of the pushrod, when FULLY inserted.
