Nelbur, I say carbon build up because I had previously looked at the brake disc and there was a build up of a dark gray substance on the disc. that just would not scrap off. I just presume this is causing the squeal. I do have some anti-squeal grease and will apply it to the pads and see what happens. I suppose I could take the brake disc to a shop and have them mill this build up, off.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member