Spring brake cylinder

The pneumatic actuator (35; 60) for the brake system of a vehicle, having the following features: - a rear cylinder (36; 61), in which a rear piston (45; 71) is displaceably arranged, - a side of the rear piston (45; 71) and the inner wall of the rear cylinder (36; 61) form a rear ventilation chamber (49; 73) from, - on the other side of the rear piston (45; 71) is a storage spring (39; 62) is provided, - a front cylinder (20 ', 20' '), in which a front piston (24; 24' ') is movably arranged, - a rear side of the front piston (24; 24 '') and the inner wall of the front cylinder (20 ', 20' ') form a front ventilation chamber (23', 23 '') is made, - at a front of the front piston (24; 24 '') is an actuating rod (25, 25 '') provided for a brake element of the brake system, - the rear piston (45; 71) and the front piston (24; 24 '') are connected via a ...