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

See also:
Vehicle equipment
All standard, country-specific and optional
equipment that is offered in the model series is
described in this chapter. Therefore, equipment
is also described that is not available in a vehicle, ...
Fuel specifications
Never use fuels labeled at the fuel pump as metal-containing.
Do not use leaded gasoline or gasoline with
metal-containing additives such as manganese or iron; doing so can cause permanent
damag ...
Stowing cargo
BMW X5
BMW X5
BMW X6
BMW X6
▷ Very heavy cargo: when the rear seat is not
occupied, secure each of the outer safety
belts in the BMW X5 in the opposite buckle.
▷ Heavy cargo: ...
