New brakes for Super C

1: Should the actuating balls be lubricated or oiled in any way? I didn't put anything on them and they seem to work great but am wondering if I should go back in and put a lubricant on them to either preserve the surface or ensure continued safe operation.

2: I cleaned up the wear surfaces (actuator external serfaces, housing internal surface, and wear surface on transmission case) with a wire brush on a hand held grinder. This seemed to polish things up nicely but I am wondering if this should be done and if this is the right tool. Also what protection (if any) should be used when performing this (I did the work outside on a windy day so that if it was asbestos or something it would be gone before I breathed it.

Like I said they work fine but would be interested in the proper approach to these two items in the event I do this again on another tractor (or again on this one).

Thanks in advance.
Lance