In a suspended fork I use a Shimano Nexave BR-IM75-F roller brake and the cooling disc of the brake is not tighly fixed on the hub and it was like that since I got the roller-brake installed. I'm not sure whether this is "by design" or a fault. Opening the brrake side of the hub didn'r reveal nay way to make the fit tigher.
Anyway, It works fine for stoppping, but when I go over rough terrain the disc seems to rattles a lot, which creates quite a bit of noise. - Not nice!
Any idea what I can do?
Here is a picture of the Brake (I hope it helps understanding the situation!):