I hope you have flushed the brake fluid out and only have fresh fluid in there (it'll take a couple of pints or more...

I can't imagine why you are having the problem unless you drive with your foot resting on the brake pedal or something like that (not suggesting you do, but that's the only thing I can think of...).

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Kirk
Las Vegas
2016 X5 40e Mineral White/Black Dakota Leather, ZLL, ZCW, ZDA, ZDB, ZPP, multi contour seats, rear side window shades, HK stereo
2011 E90M3, 6-speed manual