Vehicle with a high-pressure storage device

The vehicle has a high-pressure accumulator (12), into which a hydraulic motor (10) is provided for storing braking energy during deceleration of volume flow. The volume flow of the hydraulic motor is driven to support a vehicle operator by the high pressure accumulator. The hydraulic motor is throttled for generating a retarder braking moment of a hydraulic volume flow during the deceleration. A proportional valve is integrated in a control module (11) as a throttle valve for variably controlling the volume flow on the deceleration.