A pressure reducer, comprising an outer cylinder with a first air supply connector on a first end side of the outer cylinder and a second air supply connector on a second end side of the outer cylinder is provided. A piston can be guided movably in the outer cylinder. A first air chamber is arranged between the first air supply connector of the outer cylinder and the first front surface of the piston, and a second air chamber is arranged between the second air supply connector of the outer cylinder and a second front surface of the piston. The surface areas of the two front surfaces of the piston are of different size. The pressure reducer is suitable for reducing a second air pressure which prevails in the second air chamber in a pulsed manner proportionally to a first air pressure which prevails in the first air chamber, by a first air connection.