Brake System for Motor Vehicles

Disclosed is a brake system for a motor vehicle having actuating unit (1) consisting of a brake booster (2) operable by a brake pedal (5) and actuatable independently of the driver's. A master brake cylinder (3) connected downstream of the brake booster (3), to which master brake cylinder wheel brakes (13, 14, 15, 16) of a motor vehicle are connected, an element (21) to detect a deceleration request of the driver, a hydraulic control unit (HCU) (17) for performing driving-dynamics related control operations (ABS, ESP, TCS . . . ), which is connected between the master brake cylinder (3) and the wheel brakes (13, 14, 15, 16) and includes at least one hydraulic pump (24a, b), a first electronic control unit (7) which is associated with the actuating unit (1) and serves to actuate the brake booster (2), a second electronic control unit (12) which is associated with the hydraulic control unit (HCU) (17) and serves to drive the components thereof. In order to allow cross-linking of the two electronic control units (7, 12), the first electronic control unit (7) supplies the second electronic control unit (17) with a nominal value (pnominal) of the hydraulic pressure that can be introduced into the brake system along with a request (St) for activation of the hydraulic control unit (HCU) (17).