Parking brake button

The parking brake button is located in the center console behind the gear lever switch (GWS). With the engine running or vehicle moving: The parking brake has a hydraulic effect on the disc brakes of the front and rear axle via the DSC. With the engine off and vehicle at a standstill: The parking brake employs Bowden cables and the electromechanical actuator unit to operate the drum brakes on the rear axle. Driving off against the blocked brake pressure leads to another pressure increase and a Check Control message. Starting the engine leads to a switch from electromechanical to hydraulic parking brake engagement.

Fig 1: Parking Brake Button And Function Indicator Light

Courtesy of BMW OF NORTH AMERICA, INC.

The DSC receives additional input signals from the following components: