pneumatic control valve of a compressed - air brake system of a vehicle , having at least one first valve system which is arranged in an upper housing and has a first valve piston which interacts with a first valve and can be actuated manually or by means of an actuator via a spring element by means of a plunger piston , having a second valve system which is arranged in a lower housing with a coaxially arranged second valve piston which can be actuated pneumatically and / or mechanically by the first valve system and with a second annular plate valve , the first valve piston is guided via the plunger piston in the cylindrical guide in the housing upper part .