50 of the damping bush 40 increases from the diameter in the surface section 52 to the diameter in the surface section 51 in this case the surface section 55 is axially longer than the surface section 54 its length is approximately from 6 to 7 mm while the surface section 54 is only approximately 3 mm long the overall length of the damping bush in the present case is approximately 24 5 mm in the position of the piston 20 shown in fig1 the damping bush 40 is axially seated on the flange 39 of the nut 37 if pressure medium is now fed to the cylinder connection 26 the damping bush 40 is displaced by the force generated by the rising pressure by the amount of its axial play toward the piston 20 until its end face 42 rests against the piston pressure medium can now flow through the axial gap between the end face 44 of the damping bush 40 and the flange 39 of the nut 37 through the radial gap existing as a result of the radial play between the damping bush 40 and the nut 37 and through the recesses 43 of the damping bush 40 into the cylinder chamber 22 the hydraulic resistance of the flow path described along the inner wall of the damping bush 40 is much less than the hydraulic resistance between its outer surface and the wall of the passage aperture 28 the piston 20.