Abstract: In a method for determining the temperature of a wheel-braking device of a brake system, the current disc temperature of the brake disc is determined based on the last-determined disc temperature, the energy supplied to the brake disc since the last temperature determination, and the energy discharged by the brake disc since the last temperature determination. The current caliper temperature of the brake caliper of the wheel-braking device is determined by means of the current disc temperature of the brake disc.

Abstract: In a hydraulic braking system operated by an external force, for vehicles, in particular motor vehicles, having a primary pressure source which is operated by external energy and provide brake pressure to the wheel brakes during normal operation, and which also has a foot-actuated auxiliary pressure source which supplies the wheel brakes with brake pressure during emergency operation, to increase the degree of safety, a special hydraulic circuit is provided wherein, during emergency operation, only comparatively few valves between the wheel brakes and a hydraulic reservoir have to be closed so as to be free of leakage, while operational safety is increased by the valves being connected in series.

Abstract: In a hydraulic braking system operated by an external force, for vehicles, in particular motor vehicles, having a primary pressure source which is operated by external energy and provide brake pressure to the wheel brakes during normal operation, and which also has a foot-actuated auxiliary pressure source which supplies the wheel brakes with brake pressure during emergency operation, to increase the degree of safety, a special hydraulic circuit is provided wherein, during emergency operation, only comparatively few valves between the wheel brakes and a hydraulic reservoir have to be closed so as to be free of leakage, while operational safety is increased by the valves being connected in seris.

Abstract: A brake system with hydraulic brake boosting has a hydraulic actuating unit which comprises a hydraulic reservoir, a brake pedal, a brake-pressure generator and a pedal-travel simulator, a hydraulic unit comprising a pressure generator, a hydraulic wheel-brake device and a control unit for coordinating the functions of the actuating unit, of the hydraulic unit and of the wheel-brake device. The pedal-travel simulator possesses a variable displacement volume which is connected to the hydraulic reservoir via a hydraulic line. In order to design electrohydraulic brakes by simple means so as to be more fail-safe, a return line is provided between the wheel-brake device and the displacement volume of the pedal-travel simulator.

Abstract: In a method for determining the temperature of a wheel-braking device of a brake system, the current disc temperature of the brake disc is determined based on the last-determined disc temperature, the energy supplied to the brake disc since the last temperature determination, and the energy discharged by the brake disc since the last temperature determination. The current caliper temperature of the brake caliper of the wheel-braking device is determined by means of the current disc temperature of the brake disc.

Abstract: The invention provides a valve arrangement for controlling the brake pressure in a hydraulic power-brake system. By actuating a brake valve, a brake pressure proportional to the actuation force builds up in an outlet pressure chamber, with a first ball-seat valve. By displacing an actuation piston from its normal open position in which the outlet pressure chamber is connected to a relief chamber which is continuously kept free of pressure, the first ball-seat valve can be adjusted into a blocking position. After the first ball-seat valve has closed, further axial displacement of the actuation piston, (out of its normal blocking position, in which an inlet pressure chamber which is subjected to the high outlet pressure of a pressure accumulator is blocked off with respect to the outlet pressure chamber) moves a second ball-seat valve into its open position.

Abstract: A method determines an instantaneously optimum pressure of brakes of a trailer connected to a tractor. Regulation to a desired value of a coupling force existing between the tractor and the trailer is performed by varying the braking pressure of the trailer. A target value, in a braking process, of the pressure of the trailer brakes is determined at least indirectly from the assignment of pressure of the trailer brakes during at least one preceding braking process in which the coupling force has been set equal to its desired value.