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.

Systems and methods are provided testing a vehicle braking system. The method includes determining a nominal brake system parameter of the brake system during a braking operation. A first testing brake operation is performed and a first brake system parameter is determined based on the first testing brake operation. A tested brake system parameter is determined based on the first testing system parameter and the tested brake system parameter is compared to the nominal brake system parameter. A brake system compliance suspicion value of the vehicle braking system is then set based on the comparison.

Example methods, apparatus, systems and articles of manufacture are disclosed to facilitate brake bleeding. Example apparatus disclosed herein include a bleed controller to actuate a first valve connected to a pump and an end of a brake line, the pump connected to a reservoir; to actuate a second valve connected to the pump and a master cylinder, the master cylinder connected to the reservoir; and to operate the pump to bleed the brake line when the first valve is actuated and to bleed the master cylinder when the second valve is actuated.

Braking systems and methods having above atmospheric pressure applied to the working hydraulic fluid of the braking system. In certain preferred arrangements, the braking system includes at least one source of pressure, which pressurizes a fluid. The pressurized fluid acts on respective pressure surfaces of the master plunger(s) and the slave piston(s) that are opposite the active or working surfaces of the master plunger(s) and the slave piston(s).

A method for controlling a force representative of a parking braking of a vehicle, having the steps of: determining, by a data processing unit, a target value of a force representative of a parking braking of the vehicle to be applied, by a first brake caliper, on a first brake disc on the basis of a value of the gradient of the road on which the vehicle is located; determining, by the data processing unit, a value of a first force contribution representative of a service braking of the vehicle applied by a first hydraulic actuator on the first brake disc; determining, by the data processing unit, a value of a second force contribution representative of the parking braking of the vehicle to be applied, by a second electromechanical actuator, on the first brake disc on the basis of a target value of a force representative of a parking braking of the vehicle which can be applied by the first brake caliper on the first brake disc, and of the determined value of the first force contribution representative of a service braking of the vehicle; operating, by the data processing unit, the second electromechanical actuator to apply the determined value of the second force contribution representative of the parking braking of the vehicle on the first brake disc.

A brake-bleeder system for bleeding two brake calipers using hydraulic brakes simultaneously is disclosed herein. The brake-bleeder system includes a fluid-reservoir with a first-tube detachably coupled to an opening of the fluid-reservoir. A three-way splitter couples the first-tube to a second-tube and a third-tube. The second-tube and the third-tube may connect to brake calipers on a vehicle.

A master cylinder for a hydraulic brake or clutch system, in particular, a handlebar steered vehicle, in particular a bicycle, comprises a housing containing a cylinder chamber, in which are disposed a piston slidable therein and a pressure chamber. A compensation chamber is connected with the pressure chamber through at least one compensation bore. Also provided is a cover closing the housing and a counterpart for mounting the master cylinder on a handlebar tube. Further provided is at least one connecting device for connecting the counterpart with the housing of the master cylinder. Included with the connecting device is a first connecting portion for connecting the cover with the housing of the master cylinder and a second connecting portion for connecting the counterpart with the master cylinder and for mounting the master cylinder on a handlebar tube.

An electrohydraulic motor vehicle brake system is provided, having a hydraulic simulator circuit for generating a pedal feedback force, having a cylinder-piston unit and having an electromechanical actuator which acts on the cylinder-piston unit and which serves for generating a hydraulic pressure in at least one brake circuit, having a first fluid path with, arranged therein, a first valve device for the selective fluidic coupling of the cylinder-piston unit to the simulator circuit, and having a second fluid path with, arranged therein, a second valve device for the selective fluidic coupling of the simulator circuit to an unpressurized hydraulic fluid reservoir. Also specified are a ventilation method for a brake system of said type, a testing method for a further electrohydraulic motor vehicle brake system with only a first valve device, and a respective computer program product, with program code means, for carrying out one of the two methods when the computer program is executed on a processing unit.

An assembly for venting a bicycle hydraulic braking system. One portion of the assembly is bleeding valve for a bicycle hydraulic braking system, comprising a valve body rotatably insertable in a seat of a brake caliper that has an axial inner cavity in fluid communication with a fluid cavity in the caliper and a closing body configured to removably held it in the axial cavity. A second portion of the assembly is a hydraulic fitting for venting the braking system. The hydraulic fitting has a fastening lip for a flexible tube, a portion to engage a tool, a portion configured to screw into a threaded cavity of the bleeding valve, and an axial passage through the fitting.

A tool for a brake system may comprise a tool body configured to fit within a recess of a body of the caliper assembly. The tool body comprises a first section; the first side comprises a raised surface; the second side comprises a base surface. The first section is to be inserted into the recess of the caliper assembly; in a first mode the first piston set is blocked by the raised surface and the second piston set is unblocked; in a second mode the second piston set is blocked by the raised surface and the first piston set is unblocked. The tool body comprises a second section to be inserted into the recess of the caliper assembly; in a third mode both the first piston set and the second piston set are blocked from movement. A brake system may comprise an improved master cylinder assembly.