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That's probably the motor in your ABS module- pretty well known problem. It can be expensive if you buy a new unit (1,500+). I'd recommend taking it out of the car yourself and sending it to "Module Masters" to rebuild it, as that is what i did. It costs around $300 plus some other stuff you need (you need to bleed the brakes afterwards), but expect your car to be out of commission for 3 weeks. Here's a post on it: http://www.e90post.com/forums/showthread.php?t=600491
 

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I would not throw money at parts just yet..

You need a Diagnostic BMW software scan for fault codes, then take it from there - could be any number of things - from battery, wheel speed sensors, DSC, etc..
 
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