The concept
The parking brake is primarily intended to prevent the vehicle from rolling while parked; it brakes the rear wheels.

See also:
Have diesel exhaust fluid refilled
This exhaust fluid is refilled by your service center
during regular maintenance. If you adhere to
this maintenance schedule, it is usually not necessary
to refill any fluids between the mainten ...
Malfunction
Comfort Access may not function properly if it
experiences interference from external sources
such as mobile phones, metal objects, overhead
power lines, transmission towers, etc.
In this case, ...
Vehicle information
Computer
...
