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I have this EXACT issue. Have about 3100 miles, has happened 3-4 times. Caught it once or twice on the dash cam, but the sound quality doesn't do it justice.
It CLEARLY has something to do with the brake, as if you time it right, it almost feels as if the ABS is going off - like a sudden severe priming of the ABS system.
Unfortunately it its truly not reproducible. It has never been associated with any error. It also never happens during driving, so I assume just has something due to the many squeals, priming, pumps that occur when starting up.
The next thing I'm going to do to reproduce is see if priming the brake pedal after the car is off whether that has anything to do with it.
It's weird, loud, and doesn't sound right. But so intermittent how could one call it a 'problem'?
Dealer said the same BS when I sent the video to them... that sounds like the fuel pump priming... Me: no it doesn't...
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