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Can you hear the vacuum pump prime when you first start the car? How do the brakes feel, are you getting assistance from the booster? What trouble shooting have you done? You aren't giving much info to go on. If it were the brake pressure sensors on the MC, I would imagine you'd be getting a different code, related to DSC or ABS. At least that's what you get in the e46 when those are faulty, but they also don't have the vacuum pump like the e9x. Sounds like it's the pump from the description of the code, maybe wiring, maybe the booster... is there a check valve inline with the hose, maybe that?
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