I just did the brake flush on both MB's 2 weeks ago. I used a pressure bleeder running at 30psi but just barely got the rear calipers to dribble out, even at that pressure. Is there a trick involved? I'm wondering because if I ever have to bleed the lines due to replacement, I'll never be able to clear the air pocket with the rates the fluid was dribbling out.

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1995 E320 -171k-km
1995 S420 -333k-km