EMF actuator
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2017 BMW X3, 2016 BMW X3, 2015 BMW X3, 2014 BMW X3, and 2013 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.
The EMF actuator is attached to the brake caliper and has a direct effect on the brake pistons. The EMF actuator consists of a servomotor and gearbox.
The two EMF actuators are activated by the EMF control unit.
| Item | Description |
|---|---|
| 1 | Brake caliper |
| 2 | three-pin plug connection |
| 3 | Servomotor |
| 4 | Transmission |
| 5 | Brake piston |
The power is transferred to a two-stage planetary gear train via the servomotor and a belt drive. A spindle with nut in the brake piston ensures the self-locking facility. The power is transferred to the brake piston via the spindle and nut. The brake piston exerts force on the brake pads in the same way as hydraulic operation, and the pads are pressed onto the brake disc. The self-locking facility of the spindle maintains the retaining force. The vehicle is also securely held in position when in a de-energized state.