Pressure actuated braking system for vehicles

The system has at least first and second brake circuits. The first circuit has at least one brake cylinder (48) for connection to a pressurized medium source for this circuit depending on a control signal from a multi-circuit braking value generator (18). The second circuit has two cylinders (2,4) for connection to a second source depending on a second control signal that exists continuously at the actuation element of a changeover valve (54).