partition 6 between the first rubber spring element which is hydraulically damped by the hydraulic fluid present in the working chamber 1 the compensating chamber 2 and the overflow channel and the second spring element which is formed by the coil springs 10 made of steel the interaction of the two spring elements guarantees an effective damping of low frequency vibrations of high amplitude due to its soft overall spring stiffness characteristic fig1 also shows that the partition 6 has in its middle a tubular partial area 15 which extends upward into the working chamber 1 and which forms a connection between the working chamber 1 and the pretensioning chamber 8 the lower opening of the tubular partial area 15 is closed by a switching element 16 designed as a nonreturn valve another switching element 17 designed as an electromagnetic on off valve which is shown in the right hand area of fig1 is located between the pretensioning chamber 8 and the compensating chamber 2 the interaction of the switching elements 16 and 17 as well as the pretensioning chamber 8 and the bottom plate 12 makes possible the build up of a hydraulic pressure cushion within the pretensioning chamber 8 solely due to the vibrations introduced into the two chamber step bearing via the engine due to the build up of such a pressure cushion in the pretensioning chamber 8 the entire hydraulic bearing is raised except for the bottom plate 12 in relation to the body and the bottom of the housing 9 is thus pressed upward against the bottom plate 12 so that the force no longer flows.