Abstract: A combined service brake and spring-loaded brake cylinder includes an air-bleed valve having a piston supporting a valve body, which is guided inside a cylinder in an axially displaceable manner, and at least one first pressure spring supported on the piston being loaded against a first valve seat on the piston. The piston is loaded by at least one second pressure spring which is supported on the piston rod, in such a manner that the valve body is pushed toward a second valve seat on the piston rod and away from the first valve seat.