I wonder if this might be somehow a phenomena of the brake pads getting
charged up.

I can't believe the wheel is insulated from the frame in any real sense. WAY
too much structural things going on there. But the surface of the pads, a
fraction of an inch from that spinning metal disk, seems wimshurst-ish to
me.

That, or it could be discharges of the car's static through the tires, but
that wouldn't explain stopping on brake contact.
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