Try blowing the line......
making sure they are disconnected at both ends.............. not a bad idea to introduce some ethyl alcohol into the lines as a flushing agent...... large hypodermic needles are available cheap at Tractor supply....... then blow the line dry before reconnecting.
Not sure on the M38 Master cylinder.....but on CMP and other older GM models they have a tiny, needle size, bleedhole in the bottom of the MC...... you returning piston, after pumping, must clear that hole for the MC to work properly...... CMP MC habe a screwed adjustment on the push rod that fits into the MC..... playing with this adjustment will allow the piston to clear the pinhole in the floor of the MC.......PIN HOLE is visible from the filler opening.
Good luck.
__________________
Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
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