For operation of a hydraulic power vehicle braking system for autonomous driving, a brake pressure is generated using a second power brake pressure generator if, after a predefined first time span, no brake pressure or insufficient brake pressure has been generated using a first power brake pressure generator. The generation of the brake pressure using the second power brake pressure generator is aborted if, within a second time span, which is longer than the first time span, no error message is present from the first power brake pressure generator.

For operation of a hydraulic power vehicle braking system for autonomous driving, a brake pressure is generated using a second power brake pressure generator if, after a predefined first time span, no brake pressure or insufficient brake pressure has been generated using a first power brake pressure generator. The generation of the brake pressure using the second power brake pressure generator is aborted if, within a second time span, which is longer than the first time span, no error message is present from the first power brake pressure generator.

For operation of a hydraulic power vehicle braking system for autonomous driving, a brake pressure is generated using a second power brake pressure generator if, after a predefined first time span, no brake pressure or insufficient brake pressure has been generated using a first power brake pressure generator. The generation of the brake pressure using the second power brake pressure generator is aborted if, within a second time span, which is longer than the first time span, no error message is present from the first power brake pressure generator.

For operation of a hydraulic power vehicle braking system for autonomous driving, a brake pressure is generated using a second power brake pressure generator if, after a predefined first time span, no brake pressure or insufficient brake pressure has been generated using a first power brake pressure generator. The generation of the brake pressure using the second power brake pressure generator is aborted if, within a second time span, which is longer than the first time span, no error message is present from the first power brake pressure generator.

A tractor protection valve having a parking brake supply port, a parking brake delivery port, an exhaust port, and a quick release valve positioned between the parking brake supply port and the parking brake delivery port. The quick release valve is movable between a supply position allowing fluid to flow from the parking brake supply port to the parking brake delivery port and an exhaust position allowing fluid to flow from the parking brake delivery port to the exhaust port. The quick release valve may include a diaphragm that is movable between the supply and exhaust positions. The quick release valve may include a valve body that is positioned in a housing of the tractor protection valve.

A method for operating a motor vehicle including a hydraulic brake system having at least one controllable first hydraulic actuator and one controllable second hydraulic actuator. According to an example embodiment of the present invention, the motor vehicle is decelerated according to a deceleration specification by controlling a selected one of the hydraulic actuators. A current wear condition of the first hydraulic actuator is ascertained, a current wear condition of the second hydraulic actuator is ascertained, and the selection of one of the hydraulic actuators is made according to the ascertained wear conditions.

A method for operating a motor vehicle including a hydraulic brake system having at least one controllable first hydraulic actuator and one controllable second hydraulic actuator. According to an example embodiment of the present invention, the motor vehicle is decelerated according to a deceleration specification by controlling a selected one of the hydraulic actuators. A current wear condition of the first hydraulic actuator is ascertained, a current wear condition of the second hydraulic actuator is ascertained, and the selection of one of the hydraulic actuators is made according to the ascertained wear conditions.