If there are no visible leaks anywhere, then most probably the master cylinder seals indeed. You will need to double check though to make sure that none of the rubber hoses or metal pipes have a small leak.
I have a spare one from a GDI, and I am 99% sure it is the same on all manual cars, but I will need to check first
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Current car: 2002 S40 1.9D, 1992 240SE
Nullius in Verba
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