EMF: electromechanical and hydraulic parking brake
WARNING: This page does not describe the selected car, but rather 45 other vehicles, including the 2016 BMW M5, 2016 BMW 550i xDrive, 2016 BMW 550i, 2016 BMW 535i xDrive, and 2016 BMW 535i. However, it is still accessible from the selected car via links, so may be relevant.
The EMF is an electromechanical parking brake. DSC generates hydraulic stopping power whenever the engine is running. EMF uses an actuator to provide mechanical retaining force when the engine is off.