Have someone help you.Bleed the old way start at right rear have someone pump and hold while you bleed.Continue till clear fluid.Now left rear(drivers rear).Then Right front,then left.This should push the air out that got in.
If its still low pedal repeat or use stick method. Stick Method,wedge a stick,broom handle to hold brakes down while you go to bed.Repeat might take 5 nights but it does work.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt