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

See also:
Transmitting the settings
Your personal settings can be taken with you to
another vehicle equipped with the Personal Profile
function. For more information, contact your
service center.
Transmission takes place via:
...
Brake assistant
When you apply the brakes rapidly, this system
automatically produces the maximum braking
force boost. It thus helps to achieve the shortest
possible braking distance during full braking.
This ...
Required fuel
Super premium gasoline/AKI 91
This gasoline is highly recommended.
Gasoline with lower AKI
However, you may also use gasoline with less
AKI.
The minimum AKI Rating is 89.
If you use gasoline wi ...
