I think it may have to do with the Auto Hold function. I know you mentioned in your previous thread that Auto Hold was not engaged, but it could still be malfunctioning and causing the problem, even if you have not activated it. Auto Hold is a new feature for the 2008's.

It could also have something to do with the steering angle sensor (since you also have a problem with the turn signal not resetting). There were a batch of steering angle sensors that were bad a couple of years ago on the E60, E63 and since these new turn signals don't have any mechanical engaging and disengaging they must rely on the steering angle sensor to turn off.

Let us know what the outcome is.

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rodybmw