Pressure control device (7, 8, 9, 18, 22, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) for a vehicle, the vehicle having at least one engine for generating vehicle drive power, a compressed air supply and storage installation and a compressed air compressor coupled or couplable to the vehicle engine, and the pressure control device (7, 8, 9, 18, 22, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) having at least one electronic control apparatus and at least one valve assembly (7, 8, 9, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) for the controllable connection of a compression space of the compressed air compressor to the compressed air supply and storage installation, with the features: b) the pressure control device (7, 8, 9, 18, 22, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) is designed, in a compressed air generation mode, for connecting the compression space to the compressed air supply and storage installation for the conveyance of compressed air from the compression space into the compressed air supply and storage installation, c) the pressure control device (7, 8, 9, 18, 22, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) is designed, in a compressed air expansion mode, for connecting the compression space to the compressed air supply and storage installation for the conveyance of compressed air from the compressed air supply and storage installation into the compression space, c) the pressure control device (7, 8, 9, 18, 22, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) is designed for changing over from the compressed air generation mode into the compressed air expansion mode, and vice versa, as a result of the electrical actuation of one or more electrically actuable valves (7, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) of the valve assembly (7, 8, 9, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) by means of the electronic control apparatus, characterized in that at least some of the electrically actuable valves (7, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) are integrated in a cylinder, in particular into the cylinder head, and/or at least some of the electrically actuable valves (7, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) are integrated into a crankcase of the compressed air compressor. b) the pressure control device (7, 8, 9, 18, 22, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) is designed, in a compressed air generation mode, for connecting the compression space to the compressed air supply and storage installation for the conveyance of compressed air from the compression space into the compressed air supply and storage installation, c) the pressure control device (7, 8, 9, 18, 22, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) is designed, in a compressed air expansion mode, for connecting the compression space to the compressed air supply and storage installation for the conveyance of compressed air from the compressed air supply and storage installation into the compression space, c) the pressure control device (7, 8, 9, 18, 22, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) is designed for changing over from the compressed air generation mode into the compressed air expansion mode, and vice versa, as a result of the electrical actuation of one or more electrically actuable valves (7, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) of the valve assembly (7, 8, 9, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) by means of the electronic control apparatus, characterized in that at least some of the electrically actuable valves (7, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) are integrated in a cylinder, in particular into the cylinder head, and/or at least some of the electrically actuable valves (7, 23, 24, 57, 58, 60, 70, 71, 80, 81, 82, 90) are integrated into a crankcase of the compressed air compressor.