On Friday (after 1 day of heavy rain here in NorthEast), I noticed a brake squeal while braking from 40mph to zero. It appears coming from the left side. Not sure if front of back but i am leaning toward the back wheel.

The problem is that it's sporadic.. Maybe 10-20% of the time. I checked the pads and they seems like new (at least 8mm each).. Keep in mind that they are Axxis Dustless Pads that I had installed maybe 6-7 thousand miles ago. I am further puzzled by the sound. It's not really a squeal, but more of a metal on metal grinding squeeking sound... It's hard to explain...

any ideas?

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2011 X5 3.5D - Platinum Gray / Black Leather / Dark Bamboo, Sports w/ 20's, Adaptive Drive, Comfort Seats, Cold Weather, Premium, Sound, Rear Climate, Technology, Comfort Access, Auto High Beams, Heated Rear Seats, Running Boards, Roof Rails w/Rola Crossbars, Space-saver Tire, Moonroof visor, P/Q Brake Pads, Cargo Mat, Weathertech All Weather Mats, Draw-Tite Hitch.

2010 X5 4.8i - Lemon'd 12/2010.
2006 X5 4.4i - Sold 11/2009.
2004 X5 4.4i - Stolen 8/2005. R.I.P.