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maybe too much grease greg??The nilos seals generally work very well, but the bearing/seal combination is important. The bearing cup/cone recommendation for these brakes does not allow for the nilos seal to contact the outer race and "Seal" correctly because the outer race is different and allows the inner race to sit deeper into the hub. The felt seals available now are not of the same strength as the original material found years ago (a bit like rubber products now) and they tend to roll themselves up into a greasy mess. I'm still working on an answer as I'm installing two sets of these brakes as we speak. On an earlier machine I had tried the brass seals but they still leaked grease somehow.