brake bleeding firm now spongie.

The front calipers are mounted with the bleeders towards the front and lines to the rear, the rear shoes are adjust out to contact the drum with a little drag. I'm not sure if my buddy was letting the peddle come all the way up to let it fully refill. I hope the mc isn't messed up if so that was a waist of a $6 keeper bushing. Is there an over travel on mc that could be letting air in? I read that the system should be bled with the caps off and I've been putting the caps back on when pressure bleeding to avoid getting dot3 on my new paint. Could that be the problem as it has a lot of vacuum when I pull the caps off? I've never delt with the plastic Res mc.