i had a similar issue. parked in 40 degrees celsius (105 deg fahreheit) blinding heat for over 2 hours. came back to the car and pulled the electronic brake but it said parking brake failure on the dash. scared the shit out of me. waited about 5 seconds and released it again and the parking brake disengaged and the failure light went off. i think its to do with strong ambient heat messing up the bmw sensors LOL
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