Ive seen brake squeak appear on my old x5 due to excessively light braking over a long period of time (i.e. an 8 month winter). If you tend to drive your car in slow moving traffic a lot, that could be the cause (I think the word is that weather and dirt/rust can cause the surface of the disc to become uneven).
Take the beast out for a little while and drive balls to the wall - make sure to include lots of hard braking. If that doesnt fix it, it may be a resonance problem that is more annoying to get rid of. Ive seen people fix brake noise by changing to a different brand of brake pad and there might be some coatings available that might help. Id try some hard driving first and see if it works though, its cheaper and so much funner.
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