Doubt the hub needs greased
OK IIRC the hubs are a sealed unit so no way to grease.
Have you replaced them recenty?
I know on my 93 ofter I replaced the hubs, the dust sheid behind the caliper scrapes on the disc a little. And this also stops when applying the breaks. I fixed mine like any good redneck, with a large screwdriver and a hammer, and bent it away from the disk slightly.
Is worth checkin even if you haven;t done the bearings lately.
Am sure Will or a couple of other "Gods" here will have more ideas and probably be right on the money, they have always been with my problems