After rebuilding it I put in back on the car ands tried to bleed the brake's well the pedal would not recover.
So I pulled the master and tried to bench bleed it in the vise and the piston does not come back.
So I plugged the opening for the line and then it does seem to come back.
I was wondering if in addition to spring pressure if hydraulic pressure helps to push the piston back ?

What's the proper procedure for bleeding the master and the 4 wheels ??

don't know if tis will help but here is a list of links for some guys that may have an answer for you.

http://www.merc583.addr.com/mopar/p15pages/links.html