The brake bleeding sequence on most Saturns are R-rear, L-front, L-rear, R-front. If you bleed from R.R then L.R & so on it will be nearly impossible to bleed out. Also make sure the rear brakes are adjusted up snuggly with wheels off the ground, you should be able to hear the brakes drag when you spin the wheels. This could account for some of the loss of pedal or trapped air could also. Most Saturns have a pretty good pedal unlike other GM's. If you have ABS brakes it is possible that air is trapped in the ABS pump which you would almost need to activate the ABS pump with a Tech II diagnostic tool inorder to remove trapped air with-in the ABS pump. Hope this helps.