Abstract: A twin power valve assembly (10) for a hydraulic braking system having a single body (16) with twin power valve arrangements, each having a spool (36, 36?) with a longitudinally extending passageway (36D, 36D?) for providing a modulation of the pressure applied to the brakes, and an integral balance piston (60, 60?) contained within the body (10) that equalizes the pressure applied to the left and right hand brakes when both brakes are applied.

Abstract: A twin power valve assembly (10) for a hydraulic braking system having a single body (16) with twin power valve arrangements, each having a spool (36, 36?) with a longitudinally extending passageway (36D, 36D?) for providing a modulation of the pressure applied to the brakes, and an integral balance piston (60, 60?) contained within the body (10) that equalizes the pressure applied to the left and right hand brakes when both brakes are applied.

Abstract: A combined master cylinder and dump valve includes a piston slideable within a body bore that defines a master cylinder for pressurizing a brake port. The piston includes a piston seal for isolating a pressure port from a tank port, a piston bore, a first piston hole set for hydraulically connecting the pressure port to the piston bore and a second piston hole set for hydraulically connecting the piston bore to the tank port. A plunger slideably received in the piston bore has a plunger hole set for selectively connecting the first piston hole set with a plunger bore, and a plunger seal arrangement for selectively isolating the first piston hole set from the plunger bore. The plunger bore is hydraulically connected to the piston bore.