As far as greasing the bearings, I would think always a good idea, but be sure to clean excess grease. The guys that installed my electric brakes said a common problem they saw was people greasing way more than needed, and all the excess grease going all over the brakes. You can't just give a few pumps and be done.
I'm no expert but this makes sense to me.
I'm no expert but this makes sense to me.