This is on our 2016 Explorer. Trying to chase down a braking vibration at higher speeds. Just replaced the rear rotors and pads, so I know those aren’t the issue. The pictures here are from the fronts. They were replaced about 3 years ago (pads and rotors), and the wear is actually very even on both sides. The slide pins and pads move freely as they should and brake fluid was recently flushed so that’s not an issue. But the inner diameter portion have these blackish deposits it looks like. Are these pad deposits? When I replaced the rear brakes a couple weeks ago I did a proper bed-in procedure, and it didn’t touch these black spots on the front. I want to replace the rotors but don’t want to just throw parts at it.