Nope zero chance. It's for sure the boost acting on its own. Checks all the boxes and exactly matches the symptoms.

You should be able to loosen the nuts on the master cylinder to confirm.

It looks like the o-ring seal might be fat enough to perform this test and get the brakes to work properly.


–awr–

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)