In a brake device for a motor vehicle having a first and a second hydraulic brake circuit, the second brake circuit is decoupled from the main brake cylinder in partial braking operations, and is operated with the aid of a pressure accumulator controlled by a control device, which takes an additional deceleration effect due to an active power component, e. According to quality of motion vectors, a corresponding image output mode is determined dynamically. Conventional PFDs can miss clock edges. The expansion joint unit also maintains the pump in substantial contact with the lower surface of the vessel even when thermal expansion causes the vessel to expand and the position of the discharge pipe to lift.