my update. About 2/3 of the ring has disappeared, and 1/3 still remains with very light rust. I'm thinking the rest will go away eventually.
The only thing I did was re-bleed my brakes (because we accidentally put air in the lines, not good). Maybe there wasn't enough hydraulic pressure on it. Because when I saw the air bubbles in the rear lines, WOW...it was a lot of volume (looking at the vinyl tubing, there was about 1 ft. of pure air between the fluid.
Thanks for all the help guys.
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