A method for estimating water content of brake fluid in a brake system including brake calipers and a brake fluid container, the brake calipers and the container each including a sensor configured to detect a water content of the brake fluid, the method including: arranging the brake system in a controlled environment; for a predetermined time period, exposing the brake system to a controlled temperature and humidity such that an increase in water content in the brake fluid is accelerated; determining the water content of the brake fluid in the brake fluid container and in each brake caliper as a function of time; and based on the determined water content as a function of time, establishing a model describing the relation between the water content of brake fluid in a brake caliper and the water content in the brake fluid in the brake fluid container.

A method for estimating water content of brake fluid in a brake system including brake calipers and a brake fluid container, the brake calipers and the container each including a sensor configured to detect a water content of the brake fluid, the method including: arranging the brake system in a controlled environment; for a predetermined time period, exposing the brake system to a controlled temperature and humidity such that an increase in water content in the brake fluid is accelerated; determining the water content of the brake fluid in the brake fluid container and in each brake caliper as a function of time; and based on the determined water content as a function of time, establishing a model describing the relation between the water content of brake fluid in a brake caliper and the water content in the brake fluid in the brake fluid container.

The braking device for a vehicle includes a judging portion which judges whether the input piston and the output piston are in contact with or separated from each other and a control portion which outputs the control signal to the pilot pressure generating device so that the hydraulic pressure detected by the hydraulic pressure detecting device becomes a target value corresponding to a vehicle state, when judged that the input piston is not in contact with the output piston and outputs another control signal to the pilot pressure generating device, by which the pilot pressure becomes higher than the pilot pressure generated under a same vehicle state to a vehicle state in a case that the control signal is outputted when the judging portion judges that the input piston is not in contact with the output piston, when judged that the input piston is in contact with the output piston.

A hydraulic control system for control of a hydraulic motor. The hydraulic control system comprises a fluid distribution assembly having a tank, a pump to pump fluid from the tank and a directional valve for distributing pressurised fluid from the pump and to return fluid to the tank; a valve assembly fluidly connected to the directional valve, the valve assembly having a first overcenter valve and a pressure reducing valve wherein a first main line connects the directional valve to the first overcenter valve and wherein a shuttle line connects the pressure reducing valve to the first main line; a hydraulic motor fluidly connected to the valve assembly wherein the first main line connects the hydraulic motor to the first overcenter valve; and a brake assembly fluidly connected to the pressure reducing valve, wherein a drain line connects the pressure reducing valve to the hydraulic motor.

A hydraulic control system for control of a hydraulic motor. The hydraulic control system comprises a fluid distribution assembly having a tank, a pump to pump fluid from the tank and a directional valve for distributing pressurised fluid from the pump and to return fluid to the tank; a valve assembly fluidly connected to the directional valve, the valve assembly having a first overcenter valve and a pressure reducing valve wherein a first main line connects the directional valve to the first overcenter valve and wherein a shuttle line connects the pressure reducing valve to the first main line; a hydraulic motor fluidly connected to the valve assembly wherein the first main line connects the hydraulic motor to the first overcenter valve; and a brake assembly fluidly connected to the pressure reducing valve, wherein a drain line connects the pressure reducing valve to the hydraulic motor.

A brake system for a vehicle may include at least two hydraulic brake circuits, each having at least one hydraulically acting wheel brake, at least two pressure supply devices, each of which is driven by an electromotive drive, at least one valve assembly having valves for the wheel-individual adjustment of brake pressures and/or for separating the wheel brakes from, or connecting same to, a pressure supply device, at least one electronic control and regulating unit, one of which is a superordinate central control unit that controls individual control and regulating units of the components of the brake system, as well as at least one additional electric drive motor for at least one axle or wheel of the vehicle. The brake system may use the at least one pressure supply device and/or the at least one electric drive motor for controlling pressure in at least one wheel brake for steering interventions.

In order to offer an improved brake device without vacuum booster, in the case of which brake device the zero point of the cylinder piston remains as far as possible permanently within defined narrow tolerances and at the same time the impact noise is reliably reduced, it is proposed that the stop disk is elastically reversibly compressible in an axial direction over a defined compression travel and has the compression travel delimited, the delimitation being defined in a travel-controlled manner.

In order to offer an improved brake device without vacuum booster, in the case of which brake device the zero point of the cylinder piston remains as far as possible permanently within defined narrow tolerances and at the same time the impact noise is reliably reduced, it is proposed that the stop disk is elastically reversibly compressible in an axial direction over a defined compression travel and has the compression travel delimited, the delimitation being defined in a travel-controlled manner.

A hydraulic block for a hydraulic unit of a slip-controlled, hydraulic power vehicle braking system including a primary piston, which protrudes from the hydraulic block and at which a pin-shaped signal generator holder for a permanent magnet is situated. The primary piston and the signal generator holder are enclosed with a tubular housing the shape of a cylindrical bowl, at which abut two converging, tangential walls.

A hydraulic block for a hydraulic unit of a slip-controlled, hydraulic power vehicle braking system including a primary piston, which protrudes from the hydraulic block and at which a pin-shaped signal generator holder for a permanent magnet is situated. The primary piston and the signal generator holder are enclosed with a tubular housing the shape of a cylindrical bowl, at which abut two converging, tangential walls.