Abstract: An improved hydraulic brake system accommodates multiple, e.g. primary and secondary actuation forces while maintaining independence of operation between primary and secondary brake subsystems. A secondary subsystem line pressure booster draws its charging fluid from the primary system line using a split piston, free backflow, volume displacement approach. The improved brake system has a temperature sensitive condition sensing hydromechanical fuze to sense hydraulic line flow for velocity, volume, direction and pressure. The brake system also employs an input flow control valve to direct fluid flow in the secondary subsystem.

Abstract: A manually operated in-line secondary master cylinder can be configured for use with any hydraulic system which accommodates multiple manual input forces, and which requires the secondary input device to operate independently of the primary input device. The secondary master cylinder can be placed directly in a primary system operating pressure line, where it has no effect on system operation until it is actuated. Unlike a conventional master cylinder, the device draws a very small amount of charging fluid directly from the primary system line due to its use of a split piston, free backflow and volume displacement approach.