Abstract: A mobile working machine bas a front-loading mechanism with a loading device that can be raised and lowered, a hydraulic or pneumatic brake unit with at least one electronically controlled brake circuit, and a central control unit for controlling the brake circuit at least indirectly and can operate a safety function of the working machine. To carry out the safety function and avoid a collision with an obstacle ahead, the working machine has a forward-looking monitoring device with at least one distance sensor at the front and for determining the distance from an obstacle ahead of the working machine, and has a front load monitoring device with a set position sensor on the front-loading mechanism. Via the distance sensor(s) at the front of the working machine, the distance is determined to an obstacle ahead. A warning signal can be emitted and/or an emergency braking operation initiated.

Abstract: A method for checking an actual-pressure sensor of a motor vehicle brake system includes establishing the duration of a reaction interval, establishing a threshold value, operating the motor vehicle brake system in an electronic braking mode where the brake system delivers a braking pressure for operation of a trailer brake of a trailer connected to the motor vehicle. The reaction interval starts at the beginning of the braking process and pneumatic actual braking pressure values are measured by means of an actual-pressure sensor, where a starting braking pressure is measured by the actual-pressure sensor at the beginning of a braking process carried out in the electronic braking mode for the trailer. Pneumatic reaction braking pressures are measured within the reaction interval and compared to a threshold value. Brake system operation is discontinued in the electronic operating mode if none of the measured reaction braking pressures exceeds the threshold value.