Hydraulic braking system for aircraft with simultaneously actuated dual working chamber brakes.

The structure has first and second hydraulic brake circuits (N1, N2) provided with respective servovalves (103, 104) and operating simultaneously such that semi-cavities (102a, 102b) are supplied with hydraulic power by only corresponding servovalves of the brake circuits on different brakes, respectively. A single park circuit (P) is associated with a hydraulic power source same as that of the first hydraulic brake circuit. Isolation valves (107-109) isolate the brake circuits and the park circuit, respectively.