Abstract: A separating piston for a vibration damping system with a cylinder which is filled partly with damping fluid and partly with pressure gas and with a separating piston which is arranged in the cylinder and divides the pressure gas space from the fluid space in a sealing manner via a seal. The separating piston is guided in the cylinder by a guide, wherein the separating piston is provided with an additional guide between the seal and the end side facing the pressure gas space. A chamber which is open relative to the inner wall of the cylinder is arranged in the area between the seal and the additional guide.

Abstract: A shock absorber with frequency-selective action, in particular for motor vehicles, can have a working cylinder filled with a damping fluid and divided into two working chambers by a piston which has throttle valves and is fastened to a piston rod. For optimal damping adjustment in vehicle-relevant frequency ranges, the working cylinder can preferably be provided with at least two hydraulic capacitances, one of which can be connected to the lower working chamber by way of a hydraulic inductance.