Combined Service Brake and Spring Brake Cylinder with Sealing Assemblies Consisting of a Guide Ring and at Least One Sealing Element

A combined service brake and spring brake cylinder for use in a vehicle brake system, comprising:

• a service brake piston, which is arranged in a housing of the service brake cylinder;
• a spring brake piston, which is arranged in a housing of the spring brake cylinder, is actuatable by at least one accumulator spring and has a spring brake piston rod that projects through a central bore of a partition between the service brake cylinder and the spring brake cylinder in order to act on the service brake piston;
• a sealing assembly located in the central bore of the partition and sealing off an interior of the service brake cylinder from an interior of the spring brake cylinder;
• an additional sealing assembly carried by a radial outer circumferential surface of the spring brake piston for sealing off a spring chamber that houses the accumulator spring from a spring brake chamber of the spring brake cylinder;
• wherein at least one of the sealing assemblies comprises a guide ring that guides the spring brake piston rod in the central bore of the partition or the spring brake piston in the spring brake cylinder, said guide ring being composed of a more rigid material than that of at least one sealing element, the sealing element being composed of an elastomer that is connected to the guide ring by a primary forming method.