Abstract: In a hydraulic reservoir of a master cylinder for vehicle including: a main body having an internal space for storing brake fluid; a float provided with permanent magnet, so arranged as to be vertically movable in the internal space of the main body; a reed switch attached to the outside surface of the main body, the reed switch being actuated by magnetic force of the permanent magnet, when the float with permanent magnet is positioned under a predetermined level; and a hollow for attaching the reed switch to the outside surface of the main body, the reed switch is supported by a support member in the hollow, a rubber bush is tightly and elastically fitted to the inside wall of the hollow and a fixing member is so fitted to the hollow as to push the rubber bush to the support means, terminals of the reed switch being inserted tightly through holes of the rubber bush whereby the reed switch is held in the hollow.

Abstract: A load-weighed voltage corresponding to a pneumatic brake command signal is obtained from a pressure/electric transducer to control the electric brakes of a vehicle also equipped with friction brakes. An electrical feedback signal representing the electric brake effectiveness is compared to the transducer output signal to derive an error signal corresponding to the friction brake requirement necessary to supplement the electric brake sufficiently to satisfy the brake command. An electric-pneumatic transducer converts this error signal to a pneumatic signal which is connected to a first control chamber of a self-lapping type relay valve device whose delivery port is connected to the vehicle brake cylinders. A cut-off valve controls communication of the pneumatic brake command signal with a second control chamber of the relay valve to effect operation of the relay valve only in the event of a malfunction of the electrical circuit components performing the friction brake requirement function.

Abstract: A fluid pressure operable brake cylinder device including a self-adjusting portion for automatically compensating for brake pad wear and maintaining a constant clearance between the brake pad and the braking surface of a vehicle wheel in the released disposition of the brakes.

Abstract: A fluid pressure operable servo positioner for selectively positioning a mechanical member or lever by a power cylinder selectively positionable in accordance with the degree of operating fluid pressure supplied thereto through a control valve device at a pressure determined by the degree of a selectively variable control pressure supplied to the control valve device, the power cylinder including a counteracting spring for balancing the force of the operating pressure to maintain the power cylinder in the selected position and a cam member engaging the control valve device and positionable according to the position of the power cylinder for maintaining the control valve device in the selected pressure supply position.

Abstract: Electro-pneumatic brake apparatus for railway vehicles including a dynamic brake portion and a fluid pressure operable brake portion both of which are actuated by a common variable signal which produces a corresponding control pressure for effecting operation of said fluid pressure operable portion, such control pressure also being simultaneously converted to an electrical control pulse for effecting operation of the dynamic brake portion at the same time as, or at least not ahead of, the fluid pressure operable portion. The apparatus is further provided with a combined electro-pneumatic monitoring device for determining the sufficiency of the combined brake application.