87 300D -no ASR- I have suspected air in the lines so I attempted to begin bleeding from the right rear first. Method: depress brake pedal - loosen bleed screw - pedal go's to floor - keep pedal to floor and tighten bleed screw - release brake pedal from floor - keep brake fluid topped off in reservoir - repeat until no air, just fluid - tighten, go to next wheel.

After the first pump of pedal, and release of first fluid, I could not get any more fluid to come out. The fluid reservoir tank on top the master brake cylinder never dropped level to add anything!

So I tried bleeding the front and the only fluid I could get to move through was from the second stage of the master cylinder only. The first stage just go's to the beginning of the second stage and without much if any resistance picking up no fluid from the reservoir!

What am I doing wrong?