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Fairly easy to diagnose with a vacuum pressure gauge. The vacuum pump on what is now my son's 35d went out last year at I think something like 140,000 miles. Symptoms of stiff brake pedal and poor braking. In our case the booster was fine. Replacing the vacuum pump solved everything. Not too hard of a repair as I recall - everything is right up front and fairly easy to get to.
Good luck with what I hope is your last repair!
Stephen
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Stephen
2010 e70 35d- now driven by son #2
2005 e53 3.0 - now driven by son #1
2021 G05 45e PHEV - now driven by me
2008 ML320 CDI - driven by wife
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