A chassis air-suspension device for supporting a chassis of a utility vehicle on the running gear including level regulation and comprising at least the following: a) at least one central electronic control unit that predetermines at least one reference level signal characterising a reference level for at least one portion of the chassis; b) at least one level sensor (14, 16a, 16b) that generates an actual level signal characterising an actual level of the last least one portion of the chassis; c) at least one air bellows (12a, 12b) by means of which the at least one portion of the chassis is supported in relation to the running gear; d) at least one compressed-air reservoir; e) the chassis air-suspension device being of modular design and, as a module, containing at least the central electronic control unit and, in addition, at least one electro-pneumatic air-suspension module (18, 20) configured as a separate unit; f) the at least one electro-pneumatic air-suspension module (18, 20) being provided with an integrated module solenoid-valve device (22c, 22d) and an electronic module control unit (24c, 24d) that is integrated in the module solenoid-valve device (22c, 22d) with a control function, this module solenoid-valve device (22c, 22d) processing the at least one reference level signal and the at least one actual level signal, and g) the integrated module solenoid-valve device (22c, 22d) being connected to the at least one air bellows (12a, 12b) and to the at least one compressed-air reservoir; h) the electronic module control unit (24c, 24d) being so designed that it controls the module solenoid-valve device (22c, 22d) dependent on the at least one actual level signal and the at least one reference level signal in such a manner that the actual level of the at least one portion of the chassis is adjusted to the reference level by feeding compressed air from the at least one compressed-air reservoir to the at least one air bellows (12a, 12b) or by bleeding the at least one air bellows (12a, 12b) into a pressure sink (40c, 40d), characterised in that i) the central electronic control unit and the electronic module control unit (24c, 24d) of the at least one electro-pneumatic air-suspension module (18, 20) are each connected to a dedicated air-suspension data bus that is independent of at least one further data bus and communicate with one another exclusively via these dedicated air-suspension data buses, and that j) the central electronic control unit represents a master control device and the electronic module control unit (24c, 24d) of the at least one electro-pneumatic air-suspension module represents a corresponding slave control device, and k) level regulation taking place locally or decentrally inside the at least one electro-pneumatic air-suspension module (18, 20). a) at least one central electronic control unit that predetermines at least one reference level signal characterising a reference level for at least one portion of the chassis; b) at least one level sensor (14, 16a, 16b) that generates an actual level signal characterising an actual level of the last least one portion of the chassis; c) at least one air bellows (12a, 12b) by means of which the at least one portion of the chassis is supported in relation to the running gear; d) at least one compressed-air reservoir; e) the chassis air-suspension device being of modular design and, as a module, containing at least the central electronic control unit and, in addition, at least one electro-pneumatic air-suspension module (18, 20) configured as a separate unit; f) the at least one electro-pneumatic air-suspension module (18, 20) being provided with an integrated module solenoid-valve device (22c, 22d) and an electronic module control unit (24c, 24d) that is integrated in the module solenoid-valve device (22c, 22d) with a control function, this module solenoid-valve device (22c, 22d) processing the at least one reference level signal and the at least one actual level signal, and g) the integrated module solenoid-valve device (22c, 22d) being connected to the at least one air bellows (12a, 12b) and to the at least one compressed-air reservoir; h) the electronic module control unit (24c, 24d) being so designed that it controls the module solenoid-valve device (22c, 22d) dependent on the at least one actual level signal and the at least one reference level signal in such a manner that the actual level of the at least one portion of the chassis is adjusted to the reference level by feeding compressed air from the at least one compressed-air reservoir to the at least one air bellows (12a, 12b) or by bleeding the at least one air bellows (12a, 12b) into a pressure sink (40c, 40d), characterised in that i) the central electronic control unit and the electronic module control unit (24c, 24d) of the at least one electro-pneumatic air-suspension module (18, 20) are each connected to a dedicated air-suspension data bus that is independent of at least one further data bus and communicate with one another exclusively via these dedicated air-suspension data buses, and that j) the central electronic control unit represents a master control device and the electronic module control unit (24c, 24d) of the at least one electro-pneumatic air-suspension module represents a corresponding slave control device, and k) level regulation taking place locally or decentrally inside the at least one electro-pneumatic air-suspension module (18, 20).