A device for controlling braking in vehicles with two braking pedals (PS, PD), such as farm tractors, earthmovers and the like, comprises a body (30) in which there are formed: a pair of master cylinders (12S, 12D) with an associated brake booster (13S, 13D); a duct (18) for balancing braking of the rear wheels; seats (4, 5, 6) for a pair of balancing valves (14), a trailer brake valve (15) and a valve (16) for disabling braking of the front wheels; as well as passages (36, 46, 47, 62, 72) for transmitting a control pressure from the master cylinders to the valves and from the valves to outlets from the device (1) connected to the braking systems of the wheels of the vehicle and of a trailer, if any.