No fluid from the m'cyl is not going to be a blocked brake line. Take the MC to a good brake recon shop and ask them to check it. Could be a spring in the wrong place or a seal the wrong way round.
Good - Fast - Cheap: Pick any two.
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i