Tailpipes need a proper cleaning is all..
Rotor hats are aluminum, so they can be srcub'd with an abrasive cleaning pad and some aluminum wheel cleaner. Did mine before storage and they look better than new, almost polished. Aside from that, this is just lack of due diligence in the cleaning dept. We're all guilty of it, but some let things go longer than others and sometimes the corrosion is so bad you need to replace pieces..
The rotor surface has an issue and should be addressed, as your pads are not making complete contact with the rotor, as stated above.
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