:xoutpost:

A lot of the computer systems and sensors in the X5 are tied together. The brake sensors talk to the DSC, which talks to X-Drive, which talks to the transmission, and then in the other direction as well. So if something's up with your brakes, it could in turn trigger a "DSC inactive" fault. It's tough to speculate without a full diagnostic and having the BMW technicians take a look at it. I would get to a BMW center ASAP.