If the part is obsolete, the warranty is null and void. Plus Rock Auto is not a Ford authorized retailer so they would have to cover the warranty in house, not through a dealer. Same as a Motorcraft part bought from OReillys or Autozone.
These noises are difficult to diagnose, worn tires will mess you up. I had this with the KONA, WHEEL BEARING WAS THE PROBLEMThis should be a clue, I would think. The front driver side tire is in the original position. The rear tire on the driver side was moved from the front passenger side yesterday. This gives a comparison between front left and right brake dust.
I changed the caliper on the driver side last February. Had questionable pitting on the piston face, so maybe a bad caliper?
Does not pull or hang up. I can spin the tire by hand.
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Here is that link