Abstract: A dual-circuit master cylinder having hydraulic equalization is disclosed including a casing having two parallel bores and elongated pistons defining two power chambers in the casing connected to wheel brakes, a yoke including two blind bores receiving extending portion of the pistons defining two equalization chambers, an auxiliary piston operatively connected to the yoke, and a brake actuating member defining an auxiliary chamber connected to a supply reservoir via a check valve for supplying equal pressurized fluid to the equalization chambers upon movement of the auxiliary piston and yoke to displace the power pistons.