Abstract: Shock absorber with adjustable damping force, comprising a cylinder, an axially movable piston rod with a piston connected to it, a number of fluid chambers with capacities which can be changed relative to one another as a function of the movement of the piston rod relative to the cylinder, and fluid connections between at least two of the fluid chambers, whereby at least one of the fluid connections has a check valve module, whereby the check valve module is also designed with at least one valve seat, whereby a valve check element can be elastically applied against the valve seat in a check position, whereby this valve check element can also be adjusted by means of a field coil in opposition to the closing force of at least one spring in a number of positions, whereby the spring(s) is/are a unit of a row inside the check valve module, and possibly an intermediate module, which consists of a control chamber discharge valve body and a supplemental discharge valve body, characterized by a connection (17, 29, 15