The sound could be the new pads wearing in. This is common when you change pads but keep old rotors. Have you tried bedding in the brakes, assuming they are otherwise functionintg correctly?

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'06 X5 4.8is, TiAg/black, cold weather pkg., comfort seats
'07 750Li, TiAg/black, sport pkg.
'05 Ford F350 silver met./slate gray, Lariat, 6.0 PSD, CC, DRW, FX4