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I had this same problem this summer. Could be 1 or more of 3 things:
Brake Booster, Brake Vacuum Pump, or the Master Cylinder.
I replaced both the booster and the vacuum pump and the problem is fixed. I would do the pump first, as I'm pretty sure that's what fixed my issue.
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 - 2008 X5 3.0si Alpine White
Last edited by thrillcat; 10-09-2014 at 09:42 AM.
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