PURPOSE: To compactify a machine by laying a double check valve for opening at least one pressure medium connecting part and for closing the other pressure medium connecting part, in the machine provided with a casing having plural pressure medium connecting parts.

CONSTITUTION: Two brake cylinders 3, 4 are connected to a brake valve 1 via a storage container 2 in its one side, and via ABS system pressure control valves 22, 23 in the other side of it. A double check valve 6 is connected to a conduit 5 to the brake cylinder 3 via a connecting part 7, and is connected to the brake cylinder 3 via a connecting part 8. The third connecting part for the double check valve 6 is constituted as a passage connecting part 9 extending to an inside of a casing 10 to be communicated with a pressure valve 11, and the valve 11 is layed inside the casing 10 together with the check valve 6. A second double check valve 12 is contained in a side facing to the double check valve 6 in the casing 10, and the brake cylinder 4 is connected to the check valve 12.