Abstract: This invention is related to the decrease of the breakdowns that occur in the actuators by means of the application of internal ventilation system to the diaphragm piston spring brake actuators which are used in vehicles such as truck, van, bus and trailer. The internally ventilated diaphragm-piston spring brake actuator that is developed by this invention is comprised by an aluminum piston, an aluminum pipe, a park chamber, a service chamber, a piston valve (6), a piston valve spring (7), inlet air openings (11), an air transition space, a plug (13), air inlet holes, a pneumatic sealing, an outlet channel characterized in that it has a valve (26) having sealing lips (27), sealing surface of piston valve (28) and a square or rectangular sectioned sealing member.