The electronic parking brake replaces the usual handbrake. It is operated by means of two geared electric motors on the rear disc brakes. The mechanical components are designed so they will hold your parked car securely, even if the onboard electric power supply fails.
Indicator lights in the instrument cluster and in the button, plus an operating sound, tell you when the parking brake has been activated. With easy pushbutton operation, the electronic parking brake also offers more comfort and safety functions.
For example, the dynamic automatic brake release makes manual release of the parking brake superfluous. All you have to do is drive off and the brake is released automatically. And because the conventional handbrake lever is no longer necessary, you get more storage space between the front seats.
Additionally the Auto Hold function offers you more convenience and extra safety. Operated via the ABS/ESP hydraulic unit, it stops your car from rolling away accidentally when standing still or setting off. When the car is braked to a standstill, Auto Hold retains the last-applied braking pressure. You can take your foot off the brake and all four wheel brakes will stay on. If the ABS wheel speed sensors detect any rolling, the braking force is automatically increased until the car comes to a standstill again. As soon as you press the accelerator again, Auto Hold reduces the braking pressure.