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It's likely to be a light coating of overnight rust that's being scrubbed off by the brake pads to make sure the brakes work when you need them to (i.e. a feature not a bug).
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Current: 21 G21 330e | Portimao Blue | 791 M | M Sport Pro | Vis/Tech/Comfort Plus packs
Previously: 19 F20 M140i Shadow Edition | EB II || 16 F31 340i | EB II || 13 F31 330d Luxury | MG
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