A vehicular mass is determined, or a signal indicative thereof is generated, in particular for a commercial vehicle having a towing vehicle and a trailer/semitrailer. The vehicle has actuatable braking devices, which act, in particular, on the wheels of the towing vehicle and/or on the wheels of the trailer/semitrailer. At least one first acceleration value representing the vehicle's acceleration before the braking device is actuated, and at least one second acceleration value representing the vehicle's acceleration after the braking device is actuated, are measured. The vehicular mass or the signal indicative of the vehicular mass are determined and produced, respectively, as a function of the first and second measured acceleration values.