Opening the bleeder screw and finding free flowing fluid is normal...The MC is
above all else in the system and Gravity is still King on Earth.
Someone I know who turns wrenches for profit actually suggested bleeding
the brakes in this passive manner(Too much running back and forth for me).

I haven't any suggestions other than those offered.

I know the pedal should be rock hard.

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'84 300SD sold
124.128