by a high speed valve such as a control valve 4 the controller also includes a counter pulse module 5 and a memory programmed controller 6 the driving force element consists of a piston 1e which is reciprocatably movable between the end of travel areas 1a 1b on the left side in fig1 a of the counter pulse module card 2 are provided various connections for receiving and inputting signals which initiate and sense the braking operation these connections are for the first valve 4a an end of travel sensor for the first valve 7a a pre positioning sensor for the first valve 8a a pre positioning sensor for the second valve 8b an end of travel sensor for the second valve 7b and a connection for the second valve 4b on the right side in fig1 a of the counter pulse module card 2 are connections for controlling the switching elements and thus the braking of the moving element 1e during the braking phase these connections which will be further described hereinafter include an information signal connection for the first switching element 9a a command connection for the first switching element 10a a connection for the mass 11 as well as a command connection for.