I think most Shimano brakes weep slightly from the piston seals. I find that if I leave my bike hanging for a long time without using it then the rotor is often contaminated and noisy. If I use my bike regularly this doesn't seem to be an issue, maybe because the small amount of leaked oil burns off easily? In any case, a good argument to ride your bike often!
April 3, 2024, 2:15 p.m. - Skooks
I think most Shimano brakes weep slightly from the piston seals. I find that if I leave my bike hanging for a long time without using it then the rotor is often contaminated and noisy. If I use my bike regularly this doesn't seem to be an issue, maybe because the small amount of leaked oil burns off easily? In any case, a good argument to ride your bike often!