In preparation for mounting the brake assembly to the wheels, I had
to remove the wheels from their axles. When I did, I received a very
unpleasant surprise. It would seem that when the wheels were mounted
on the axle at the factory, the bearings weren’t packed with grease.
The result was this:

 and this:

 Only one of the races was rusted so that and all four bearings had to be replaced.