Any chance you've had the Brake Vacuum recall / QE carried out recently? That fault is consistent with the MSA: Brake Vacuum sensor crapping itself, I've replaced a stupid amount of these sensors recently!
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Current: 2009 E90 325i M Sport Auto
Previous: 2017 435d xDrive Gran Coupe, 2010 E90 318d SE, 2009 E90 318i SE.
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