Leaking master Cylinder

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Fudmucker

Grey Hound
Joined
May 18, 2008
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GP
Bike
BMW R80GS
:-\
I was wondering why my RH glove was staining my braking fingers.
Then I found a thin film of liquid on the lever.
The master cylinder is leaking fluid, but still braking well.

Is it likely to be the o-ring between the reservoir and the master cylinder,
or is it likely to be the master piston that's leaking...?
Parts available ex dealer?
 
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