Patent ID: 7523999

Claim:
A brake cylinder for a brake of a motor vehicle, the brake cylinder having a spring brake section performing parking brake operations via a spring force accumulator spring and a service brake section for performing service brake operations via compressed air actuation, the spring brake and service brake sections being combined into one structural unit, the brake cylinder comprising: a first piston arranged in the brake cylinder; first and second pressure chambers, the first chamber serving to actuate the service brake; a further chamber located on an opposite side of the first piston from the first pressure chamber, the first piston dividing the brake cylinder between the first pressure chamber and the further chamber, wherein the spring force accumulator spring is arranged in the further chamber on the opposite side of the piston; a second piston acted upon by the spring force accumulator spring, the spring force accumulator spring being releasable upon ventilating of the second pressure chamber; a locking mechanism for locking and releasing the second piston with respect to the first piston, the second piston being coupled for actuating the brake either directly or indirectly; wherein the spring force accumulator spring acts between the first and second pistons after release of the locking mechanism and displaces the first and second pistons relative to one another during a parking brake operation.