Please note the following points to prevent the vehicle from rolling back unintentionally on a gradient.
Pull and hold the switch
and press the accelerator. The parking brake will remain engaged and prevent any tendency to roll back down the slope.
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You can release the switch
as soon as the engine is delivering enough power to the wheels.
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Depending on the weight of the vehicle and trailer and the steepness of the slope, there may be a tendency to roll back downhill when driving away from a standstill. You can prevent this by pulling out and holding the switch
as you press the accelerator (in the same way as with a conventional handbrake).
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