Abstract: A sensor apparatus for determination of a tire internal pressure for a motor vehicle by at least one measurement sensor in the form of an optical fiber, with an evaluation and computer unit deducing a sought parameter from a change in the light wave. The at least one measurement sensor detects light changes corresponding to the shape and/or size of a tire contact area as an indicator of the internal pressure in the tire.

Abstract: A sensor apparatus for determination of a tire internal pressure for a motor vehicle by at least one measurement sensor in the form of an optical fiber, with an evaluation and computer unit deducing a sought parameter from a change in the light wave. The at least one measurement sensor detects light changes corresponding to the shape and/or size of a tire contact area as an indicator of the internal pressure in the tire.

Abstract: A method and an arrangement are provided for the return of brake fluid from a pedal travel simulator into the auxiliary brake circuit of an electrohydraulic brake system, and to an electrohydraulic brake system and a tandem master brake cylinder. For this purpose, in an emergency, the return line of the pedal travel simulator, which is connected to the brake fluid reservoir during normal operation, is separated from the unpressurized brake fluid reservoir and instead connected to the delivery side of the electrohydraulic pressure supply system or at least to the pressure accumulator of the electrohydraulic system.

Abstract: The invention relates to a return of the brake fluid out of the pedal travel simulator into the auxiliary brake circuit. For this purpose, a pedal travel simulator is designed as a spring-loaded cylinder with a coupled and activated hydraulic booster piston and with a strengthened compression spring. The compression spring conveys the brake fluid contained in the pedal travel simulator back into the auxiliary brake circuit of the electrohydraulic brake system. The spring force of the compression spring is dimensioned such that, when the piston of the pedal travel simulator is in its inlet-side end position, the pedal travel simulator has prevailing in it a minimum pressure which is sufficient to make it possible to adhere in the auxiliary brake circuit to the boundary conditions for the auxiliary brake system which are prescribed according to StVZO, EU directive 71/3210 EWG and ECE regulation 13.