A motor vehicle brake system includes a master brake cylinder actuatable by a brake pedal and having only one pressure chamber; an electrically controllable pressure supply device; a pressure medium reservoir, under atmospheric pressure from which the master brake cylinder and the pressure supply device are supplied with pressure medium; and at least two hydraulically actuatable wheel brakes. The wheel brakes can be actuated by the master brake cylinder or by the pressure supply device. The pressure chamber of the master brake cylinder is separably connected via an isolating valve to a first brake circuit supply line. The wheel brakes are divided into at least two wheel brake groups. The first wheel brake group connected to the first brake circuit supply line, and the pressure supply device connected to a second brake circuit supply line to which the second wheel brake group is connected.

A fluid level detector assembly is used to determine the level of fluid in a tank. The assembly includes a float movably mounted within the tank which corresponds to the level of fluid within the tank. The fluid level detector assembly further includes a sensor assembly for detecting movement of the float, and a mechanism for causing movement of the float hydraulically.

A filling level sensing device for a liquid reservoir, in particular for a compensation tank of a vehicle brake system, includes at least one float, at least one sensor element connected to the at least one float, and at least two sensors for detecting the position of the at least one sensor element. The float may be designed to come into contact with the liquid in the liquid reservoir. At least one of the two sensors may sense a change in the filling level of the liquid reservoir depending on the position of the at least one sensor element relative to the at least two sensors.

A method for operating a brake system having a brake fluid reservoir having a first and a second reservoir chamber which are separated by a first partition wall, wherein a first filling level in the brake fluid reservoir is determined by a first sensor element, and a second filling level in the brake fluid reservoir is determined by a second sensor element, wherein the brake system is operated in a first fallback operating mode when the determined first filling level in the brake fluid reservoir falls below a first predetermined level (p.sub.1), and wherein the brake system is operated in a second fallback operating mode when the determined second filling level in the brake fluid reservoir falls below a second predetermined level (p.sub.2), wherein the second level (p.sub.2) is lower than the first level (p.sub.1), and to a brake system.

A method for operating a brake system for motor vehicles, comprising a master brake cylinder actuable by a brake pedal, an electrically controllable pressure provision device, a pressure medium reservoir tank, from which the master brake cylinder and the pressure provision device are supplied with pressure medium, and at least two hydraulically actuable wheel brakes and at least one electrically actuable inlet valve per wheel brake, wherein the wheel brakes are actuable either by the master brake cylinder or by the pressure provision device, the pressure medium reservoir tank is monitored by a device for determining a level of the pressure medium, wherein the wheel brakes are divided into at least one first wheel brake group and one second wheel brake group, and wherein the inlet valves of the first wheel brake group are closed when the determined level falls below a first limit value (s.sub.1).

A reservoir tank includes a reservoir body defining a storage chamber for an operating fluid; and a float guide in the storage chamber. The float guide forms a float chamber on the inner side. The reservoir tank further includes a fluid level detection device that has a float moving up and down in the float chamber in accordance with fluctuations of a fluid level, and has a detector detecting when the float is below predetermined position. The reservoir tank is provided with a slit in the float guide. The slit is in communication with the storage chamber and the float chamber. An operating fluid passage is provided on an inner face of the float guide which is continuous with the slit, which is in communication with the slit and the float chamber.

A unit for detecting a filling level of a liquid in a container. The unit includes at least one float gauge, which carries at least one permanent magnet, and including at least one switching unit, which is actuatable by the permanent magnet and is fastened in or at the container. It is provided that at least one energizable magnetic device for generating a magnetic field is assigned to the switching unit, which, when sufficiently energized, generates a magnetic field, which actuates the switching unit when the switching unit is functional.

The reservoir tank includes a reservoir body which reserves a fluid in an inner portion thereof formed to be in a hollow box shape. The reservoir body includes a port extending outward, a reservoir chamber which reserves the fluid and a port chamber which volume is smaller than that of the reservoir chamber and is in fluid communication with the port and a first communication passage positioned at a portion lower than a changeable liquid surface of the fluid reserved in the reservoir chamber in a vertical direction and provided at the first partition portion to allow the fluid communication between the reservoir chamber and the port chamber and wherein the port chamber and the port are kept being a state in which they are filled with the fluid supplied from the reservoir chamber via the first communication passage.

A method for determining a leakage in a hydraulic brake system in a vehicle includes evaluating a suspected leakage in the hydraulic brake system and taking into account an actuation of an automated hand brake during the evaluation of the suspected leakage. The hydraulic brake system has a hydraulic footbrake and the automated hand brake has an electromechanical actuator. The hydraulic footbrake and the automated hand brake are configured to act on the same brake piston.

According to aspects of the present disclosure, a vehicle includes a braking system, at least one controller, and at least one memory. The braking system includes a brake fluid therein and a brake pedal. The at least one memory stores instructions that, when executed by the at least one controller, are configured to: determine, via a boiling-point module, a boiling point of a brake fluid within a braking system of a vehicle; determine, via a fluidic-properties module, fluidic properties of the brake fluid; determine, via a corrosion-inhibitor module, an amount of corrosion inhibitors within the brake fluid; determine, via a reserve-alkalinity module, a reserve alkalinity of the brake fluid; estimate, a brake-fluid life module, a remaining effective life of the brake fluid using the boiling point, the fluidic properties, the amount of corrosion inhibitors, and the reserve alkalinity; and adjust a response curve of the braking system.