I had a similar problem with fluid leaking from the master cylinder where the
hose connects. DNF'd the first enduro. Didn't find the leak right away, the level in the M.C. kept getting low.
I used a new copper sealing washer and tightened it way down. and I check the torque every ride......no more problem. (except for the rebuild kit I had to put in it last year when it started leaking out the plunger area) @#$%^
There ARE some special washers available ("Doughty" washers from UK)
that have neoprene sealing ring bonded to the inside of a metal washer.
Mcmaster Carr Supply has them, also Aircraft Spruce I think. I don't know
that neoprene is compatible with DOT 4 brake fluid, though........
The back-bleeding proceedure above should work! Good luck. There is an article on the AJP America website also, that talks about having
the plunger adjustment too far "out" and not letting the piston "gulp" in a new bit of fluid each time you squeeze the lever. Check it out.
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