Abstract: A combined lubrication and brake actuating fluid system for a drive axle, separate from the transmission hydraulic system of the vehicle, which utilizes the differential housing as a reservoir and uses the extreme pressure gear lubricant therein as the operating fluid. A pump distributes the gear lubricant through a pressure balanced spool valve, responsive to a brake pedal controlled pilot pressure valve associated with the transmission hydraulic system having output ports to both the lubricating inlet of the axle assembly and also to the brake actuating input port.

Abstract: A brake control for a vehicle, especially a heavy work vehicle, having both service and emergency braking systems, each system having its own hydraulic actuator, having a fluid reservoir, a hydraulic pump and a manually actuable control valve wherein the control valve includes a variable pressure regulating portion having an inlet from the pump, an outlet to the service brakes and a spool controlling the outlet pressure to the service brakes. The control valve also has a three-way valve portion having an inlet from the pump and an outlet to the emergency brake actuators, preferably the pressure-release, spring-apply type, and an externally controlled valve stem with a wide groove which supplies pressure to the emergency brake actuators continually over much of its travel while operating the service brake portion through a compression spring disposed between the stem and the spool.