Abstract: A method for operating a brake system, which includes a power brake and a vehicle dynamics control, after detecting that the level in a brake fluid reservoir of the brake system has fallen below a minimum fill level. The method includes detecting a brake signal, advancing a power piston to a forward position in which the required brake pressure is achieved, ascertaining the amount of travel of the power piston from the home position to the current position, holding the brake pressure and further advancing the power piston by a correction distance if the brake pressure decreases during the holding. The method also includes retracting the power piston by the ascertained amount of travel after the braking process has ended and degrading the brake system when a limit value for the forward position of the power piston has been reached.

Abstract: The disclosure relates to a method for releasing an electro-hydraulic parking brake of a motor vehicle, wherein a vehicle status is determined, in dependence on the vehicle status, a pre-charging pressure demand is determined by a control device, in the event of a pre-charging pressure demand, a hydraulic pre-charging pressure is generated by a pressure generating unit, and in the event of a parking brake release demand, the pre-charging pressure is directed to the electro-hydraulic parking brake.

Abstract: In order to detect air in a brake master cylinder within a hydraulic power brake system, a brake master cylinder pressure on actuation of the brake master cylinder is compared with a comparison pressure which prevails in the brake master cylinder when it is air-free. For bleeding, brake fluid is conveyed with a power brake pressure generator through the in this case non-actuated brake master cylinder into a pressureless brake fluid reservoir, where air escapes from the brake fluid.

Abstract: A method for checking intended pressure medium-conducting contacting of circuit branches, associated with one another, of separate brake circuits of an electronically slip-controllable power brake system with two actuator units, contacted for conducting pressure medium, for generating and controlling brake pressure, in particular for a motor vehicle, and an electronic control unit for such a power brake system.

Abstract: A method for operating a brake system, which includes a power brake and a vehicle dynamics control, after detecting that the level in a brake fluid reservoir of the brake system has fallen below a minimum fill level. The method includes detecting a brake signal, advancing a power piston to a forward position in which the required brake pressure is achieved, ascertaining the amount of travel of the power piston from the home position to the current position, holding the brake pressure and further advancing the power piston by a correction distance if the brake pressure decreases during the holding. The method also includes retracting the power piston by the ascertained amount of travel after the braking process has ended and degrading the brake system when a limit value for the forward position of the power piston has been reached.

Abstract: In order to test a function in a pressure generating module of a hydraulic vehicle power brake system, it is provided to generate a brake pressure using a power brake pressure generator and subsequently hydraulically to separate a pressure regulating module from the pressure generating module by closing connection valves or hydraulically to separate wheel brakes from the pressure generating module by closing inlet valves, so that no brake fluid flows into the wheel brakes during the function test, which would reduce the brake pressure in the pressure generating module and negatively affect or prevent the function test.

Abstract: Venting a cylinder of a piston-cylinder unit of a power brake pressure generator of a hydraulic power brake system for a motor vehicle. A piston in the cylinder is displaced from a forward-displaced position back into a home position and subsequently forward again. When the piston is displaced back, a connection valve is closed so that the piston sucks brake fluid from a brake fluid container, the brake fluid flowing over a lip seal acting in the manner of a pressure relief valve as the first piston seal. During the forward stroke, the piston pushes brake fluid through the then open connection valve into the brake fluid container. Any air contained in the cylinder is pushed with the brake fluid from the cylinder and separates from the brake fluid in the brake fluid container.

Abstract: To prevent the loss of any brake fluid from a hydraulic vehicle braking system after a detected leakage, a testing or a retesting of a leak tightness of the vehicle braking system is carried out only after release, for example, after a repair of the vehicle braking system.

Abstract: Venting a cylinder of a piston-cylinder unit of a power brake pressure generator of a hydraulic power brake system for a motor vehicle. A piston in the cylinder is displaced from a forward-displaced position back into a home position and subsequently forward again. When the piston is displaced back, a connection valve is closed so that the piston sucks brake fluid from a brake fluid container, the brake fluid flowing over a lip seal acting in the manner of a pressure relief valve as the first piston seal. During the forward stroke, the piston pushes brake fluid through the then open connection valve into the brake fluid container. Any air contained in the cylinder is pushed with the brake fluid from the cylinder and separates from the brake fluid in the brake fluid container.

Abstract: A method for controlling a hydraulic volume in a system comprising a power brake and a driving dynamics control. The system is configured to hydraulically couple the power brake to the driving dynamics control. The method includes: providing a signal to build up a first dynamic pressure for the driving dynamics control; generating a first control signal by means of the driving dynamics control, and providing the first control signal to the power brake in order to provide the hydraulic volume at the hydraulic coupling; generating a second hydraulic pressure by means of the power brake in order to provide the hydraulic volume at the hydraulic coupling; providing the hydraulic volume at the second hydraulic pressure at the hydraulic coupling by means of the power brake; and building up the first hydraulic pressure in the driving dynamics control by means of the provided hydraulic volume.

Abstract: A method for checking intended pressure medium-conducting contacting of circuit branches, associated with one another, of separate brake circuits of an electronically slip-controllable power brake system with two actuator units, contacted for conducting pressure medium, for generating and controlling brake pressure, in particular for a motor vehicle, and an electronic control unit for such a power brake system.

Abstract: The disclosure relates to a method for releasing an electro-hydraulic parking brake of a motor vehicle, wherein a vehicle status is determined, in dependence on the vehicle status, a pre-charging pressure demand is determined by a control device, in the event of a pre-charging pressure demand, a hydraulic pre-charging pressure is generated by a pressure generating unit, and in the event of a parking brake release demand, the pre-charging pressure is directed to the electro-hydraulic parking brake.

Abstract: An actuator for an electric parking brake, EPB, is described. The actuator comprises a motor configured to actuate an actuating member of the EPB, as well as a reception interface configured to receive an enablement code. An enablement code is assigned to the EPB actuator which individualizes the EPB actuator against other EPB actuators. The actuator further comprises an evaluation unit configured to verify the received enablement code on the basis of the enablement code allocated to the EPB actuator and to enable a control of the motor in case of a positively verified enablement code. There is further provided a control device for the EPB actuator, an electric parking brake and a vehicle having the EPB actuator and corresponding operating methods.

Abstract: In order to test a function in a pressure generating module of a hydraulic vehicle power brake system, it is provided to generate a brake pressure using a power brake pressure generator and subsequently hydraulically to separate a pressure regulating module from the pressure generating module by closing connection valves or hydraulically to separate wheel brakes from the pressure generating module by closing inlet valves, so that no brake fluid flows into the wheel brakes during the function test, which would reduce the brake pressure in the pressure generating module and negatively affect or prevent the function test.

Abstract: A method for detecting undesirable vibrations of an actuator of an electromechanical brake includes the steps of: (1) providing an electrical signal comprising at least one piece of information about a current consumption of the actuator or a parameter correlated with the current consumption; (2) monitoring an operation of the actuator on the basis of the gradient of the electrical signal in such a way that after switching on the actuator and preferably after a subsequent delay time, which includes determining: whether the amount of an initial instantaneous value of the gradient exceeds the amount of a threshold and whether a subsequent second instantaneous value of the gradient has an inverted sign compared to the first instantaneous value; (3) evaluating the results to ensure that an undesirable vibration is assessed as detected the aforementioned conditions are met.

Abstract: In order to detect air in a brake master cylinder within a hydraulic power brake system, a brake master cylinder pressure on actuation of the brake master cylinder is compared with a comparison pressure which prevails in the brake master cylinder when it is air-free. For bleeding, brake fluid is conveyed with a power brake pressure generator through the in this case non-actuated brake master cylinder into a pressureless brake fluid reservoir, where air escapes from the brake fluid.

Abstract: A method for functional testing of an electromechanical fill level monitoring device. In order to test the plausibility of a signal emitted by a fill level monitoring device of a first pressure medium chamber, a forced actuation of this fill level monitoring device is carried from time to time. This forced actuation is carried out in that a pressure medium delivery unit in a pressure medium circuit having the first pressure medium chamber is activated for a predefined period. This delivers the pressure medium fill level monitoring device into a second pressure medium chamber via a pressure medium connection. On the basis of the signal profile output by the fill level monitoring device, the proper operation of the fill level monitoring device is inferred in the electronic control unit.

Abstract: To prevent the loss of any brake fluid from a hydraulic vehicle braking system after a detected leakage, a testing or a re-testing of a leak tightness of the vehicle braking system is carried out only after release, for example, after a repair of the vehicle braking system.

Abstract: A method for functional testing of an electromechanical fill level monitoring device. In order to test the plausibility of a signal emitted by a fill level monitoring device of a first pressure medium chamber, a forced actuation of this fill level monitoring device is carried from time to time. This forced actuation is carried out in that a pressure medium delivery unit in a pressure medium circuit having the first pressure medium chamber is activated for a predefined period. This delivers the pressure medium fill level monitoring device into a second pressure medium chamber via a pressure medium connection. On the basis of the signal profile output by the fill level monitoring device, the proper operation of the fill level monitoring device is inferred in the electronic control unit.

Abstract: A method for detecting undesirable vibrations of an actuator of an electromechanical brake includes the steps of: (1) providing an electrical signal comprising at least one piece of information about a current consumption of the actuator or a parameter correlated with the current consumption; (2) monitoring an operation of the actuator on the basis of the gradient of the electrical signal in such a way that after switching on the actuator and preferably after a subsequent delay time, which includes determining: whether the amount of an initial instantaneous value of the gradient exceeds the amount of a threshold and whether a subsequent second instantaneous value of the gradient has an inverted sign compared to the first instantaneous value; (3) evaluating the results to ensure that an undesirable vibration is assessed as detected the aforementioned conditions are met.