Abstract: A control valve for an indirectly acting compressed-air brake of a rail vehicle includes a pneumatic relay valve for controlling a brake cylinder pressure via a pilot-control circuit for generating a temporally defined pilot-control pressure for the proportional activation of the relay valve, wherein, connected upstream of the pilot-control circuit, there is provided a device for generating the braking and release times of the compressed-air brake, wherein the device for generating uniform braking and release times of the compressed-air brake has mechanisms for realizing a volume flow with constant pressure change for the compressed-air supply and the de-aeration of the pilot-control circuit.