Brakes won't hold pressure

First question is "are the bleeders at the tops" of the cylinders / calipers?

Next, tighten up the rear shoes, or temporarily, try setting the parking brake. See if this improves the pedal. If so, the rear shoes either need adjustment, or there's 'wrong parts' back there.

Bleeding..........you DO know? that when you bleed by "pumping" that you must pump and hold..........open the bleeder............close the bleeder BEFORE releasing the pedal