I have the same issue.
It started when I backed up from my garage - ignored it for a while.
Then it started happening when I drive forward at low speed as well as when backing up.
Had my local dealership look at it, my SA said they were able to replicate it but they could not get BMWNA to replace the system because of low mileage (about 16K miles during that time). I'm now at 17,800 and started to make the noise again. Emailed my SA but told me this is normal because of the "high performance semi-metallic pads".
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