Abstract: A pressurized fluid brake system for automotive vehicles of the type where the brake pedal pressure (F) is transmitted with assistance of an auxiliary pressure force to the wheel brake cylinders through pressure lines containing pressure modulator valves. The wheels are provided with transducers for measuring instantaneous wheel rotation as well as vehicle velocity. Electronic control circuitry processes and logically combines the measured values to generate control signals for the pressure modulator valves. Preferably, the modulator valves are electromagnetically actuatable valves. By virtue of the braking pressure modulator valves, brake force distribution is controlled in dependence upon the brake slip of the front wheels and, in addition, a brake slip preventing locking of the vehicle wheels will be performed.

Abstract: A brake system provided for automotive vehicles comprises a braking pressure generator (3) and a braking pressure modulator (4) which is arranged in the pressure medium conduit leading to the rear wheel brakes (16, 17) and which allows to vary the apportioning of the braking pressure to the wheel brakes of the front and the rear axle to achieve approximation to an ideal brake force distribution in dependence on the instantaneous axle load. The braking pressure modulator (4) contains valve assemblies (5) serving to supply braking pressure alternately to the wheel brakes (16, 17) of the right and the left rear wheel in such a manner that one of the two rear wheels (HR or HL) furnishes the predominant portion of the brake force allotted to the rear axle. The pressure delivery alternates to connect to the other rear wheel on each braking operation or on each brake actuation or according to predetermined time criteria.