I just replaced rear calipers and flushed new fluid in.I had a helper,the book says to start with wheel furtest from master cylinder( passenger rear,then driver rear,passenger front,then drivers front). Ok with my son manning the brakes,I have him pump 10 times,hold it to the floor open bleeder Repeat,till fuild bubble free comes out.Takes maybe 5 times till new fluid shoots out(empty master,with turkey baster,pour new).
I repeat this on all 3 remaining wheels.Some times little bubbles will still remain,what I do is take a stick or something to hold down brake pedal at night.Maybe take all week.Soon you will have top working brakes.
Note* Always check if brake pads slide freely,I have had to grind coatings that stick in calipers, or the caliper itself.

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