You seem to have checked the obvious. I would jack the car up and rotate the wheels by hand and listen carefully to see if you can pinpoint the noise. It's nearly always some debris, often a small stone, trapped between backplate and disc and easily overlooked. Flaking on a brake pad can also do it as can a rusty backplate which is disintegrating.
John
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Past : 96 855 T5 CD ruby red, 98 C70GT T5 coupe Saffron, 04 C70GT T5 convertible Navy
Present : 95 855 T5R Gul Yellow
08 C30SE Lux T5 Polestar
11 C70 Solstice T5 Polestar
19 XC40 T5 R-Design Polestar
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