Hydraulic dual circuit brake system

A hydraulic dual circuit brake system with a hydrostatic circuit (11) and a servo circuit (10) is proposed, which system is provided with an antilock system with an electronics unit (22) and two control valve units (23, 24). A servo cylinder (13) serves to separate the said hydraulic circuits (11, 10) from one another. The control valve unit (23) for the wheels of the front axle (VA) is arranged between the servo cylinder (13) and the wheel brake cylinders (27, 28) of the front axle (VA). A normally open isolating valve (25) is connected to the servo cylinder (13) on the outlet side. The servo circuit (10) is connected by way of a normally closed pressure inlet valve (26) between the control valve unit (23) and the isolating valve (25). The isolating valve (25) and pressure inlet valve (26) can be reversed by the electronics unit (22) during controlled braking. In the light of the prior art, a simplification of the brake system is obtained by dispensing with a servo cylinder. The arrangement is intended for use in passenger cars and light commercial vehicles.