😮 Glad you were able to pull up but I can imagine the thoughts that are running through your head. Sounds like a loss of servo pressure which could happen to any car although I have never heard of this on a modern BMW or perhaps loss of regenerative braking function which would be less severe.
Wait it out with the dealer pulling the codes and keep us informed. I am sure BMW HQ would be interested in this case and the diagnostics so perhaps contact them directly in parallel to your dealer.
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