Abstract: The circuit comprises a first branch (35, 20, 21) and second branch (5, 8, 9) respectively controlling the feeding of brake fluid to a driving-wheel brake (100) and a non-driving wheel brake (101). An anti-lock device controls solenoid relief valves (21, 9) which interact with pilot-controlled valves (20, 8). A solenoid anti-skid valve (35) is connected to the first branch, downstream of the junction point (6) of the two branches with the master cylinder (1) in order to ensure the possibility of braking the non-driving wheel by way of the brake pedal (3) simultaneously with an anti-skid sequence or with an accidental triggering of the solenoid valve (35).

Abstract: The circuit comprises a primary circuit (2) feeding brake motors (5) and (7) and a secondary circuit (3) feeding a brake motor (9). In normal operation a valve (11) isolates the brake motor (22) from the secondary circuit (3). The pressure in the primary circuit then controls the pressure prevailing in the brake motor (22) with the aid of a pressure balancing device (25) installed between the feed lines of the brake motors (7 and 22). In the event of the failure of the primary circuit (2) the valve (11) establishes communication between the brake motor (22) and the secondary circuit (3) to effect the braking of the wheel associated with the brake motor despite the fact that the balancing device (25) is put out of action in this situation. Application to a brake circuit equipped with an anti-wheel-lock device.