Q: DSC, ABS, Handbrake Light Stays On

Based on your description of the problem, I would guess that you have a bad wheel speed sensor or a tone ring that is jammed up with rust. The tone ring is a ring on the wheel hub with slots cut into it that the sensor reads to determine wheel speed. The signals are not as strong at low speeds, so when the sensors fail, of the rings get dirty, the problems first show up when you are moving slowly. It shouldn’t be hard to find the culprit. When the controller for the ABS and other systems sense a fault, a code is stored in the controller, even after the light goes out. So it’s a simple matter to scan the controllers and retrieve the codes to get a factual account of the problem(s). But It will have to be a BMW capable scanner. The Generic ones they use and sell at auto parts stores won’t do the trick when it comes to ABS and DSC systems. To have the system scanned at your convenience, you can contact Your Mechanic. They will send a technician with the proper equipment to your home or office to scan your BMW and let you know what it needs to fix it.