Overview
This document contains information on:
General
Function requirements
Function
General
The EFB is released either manually via the electric parking brake switch or automatically according to the driving state.
Function requirements
Ignition ON (circuit 15)
Additional function requirements for the automatic release of the electric parking brake (EFB) (automatic transmission)
Engine in operation
Seat belt tongue is inserted into driver seat belt buckle
Transmission in position D or R and accelerator pedal depressed
Trunk lid is closed if transmission is in position R
Additional function requirements for the automatic release of the electric parking brake (EFB) (manual transmission)
Engine in operation
Driver door closed
Gear engaged and accelerator pedal depressed
Trunk lid is closed if transmission is in position R
Function
Manual release of electric parking brake (EFB)
The parking brake release is requested by actuating the electric parking brake switch. The ESP® control unit actuates the left and right electric parking brake actuator motors and releases the electric parking brake (EFB) completely. A signal for the parking brake indicator lamp (red) is generated. The parking brake indicator lamp (red) in the instrument cluster goes out. The electric parking brake (EFB) is released by pressing and holding down the electric parking brake switch for a few seconds.
Automatic release of electric parking brake (Comfort Go)
The EFB is released automatically as soon as there is a sufficiently high drive torque at the drive wheels to enable the vehicle to drive off. The ESP® control unit actuates the electric parking brake actuator motors at the two rear brake calipers and releases the EFB. If a fault prevents the EFB from being released, the instrument cluster displays the message "Release parking brake" and a warning tone is sounded.