Master cylinder assemblies, particularly for operation of the brake or clutch of motorcycles or other ATVs, are susceptible to a reduction in pressure due to the introduction of unwanted gases within the hydraulic lines. As a result, the brake or clutch system may not operate as designed. The present disclosure describes master cylinder assemblies that include one or more fluid separators, with a separator at least at the compensating port of the fluid reservoir to inhibit or prevent air or other gases from entering the piston channel through the compensating or inlet ports.

A master cylinder is described. The master cylinder includes a chamber delimited by a piston and supplied from a brake fluid reservoir installed on the top of the master cylinder by an end fitting engaged in a nozzle on the body of the master cylinder. The piston has a nose of reduced section upstream of its skirt guided in the bore hole of the master cylinder and the nozzle is connected to the chamber by a drill hole issuing into the chamber at least partly upstream of the piston in rest position. A valve module is installed in the drill hole to manage communication between the reservoir and the chamber as a function of the position of the piston and the pressure in the chamber with respect to the pressure in the reservoir.

A vehicle includes a vehicle cabin, a storage chamber, and a partition wall separating the storage chamber from the vehicle cabin. The storage chamber is arranged on at least one side of the vehicle cabin in the vehicle front-rear direction. The partition wall has an opening and the storage chamber communicates with the vehicle cabin via the opening. A cover configured to open and close the opening is provided over the opening. A brake fluid pressure generation device is stored in the storage chamber. The brake fluid pressure generation device includes a reservoir tank in which hydraulic fluid is accumulated and is arranged at a position facing the opening.

A tool for bleeding brakes includes a primary assembly, a quick-connect actuator assembly, and a nozzle fitting. The primary assembly has a hollow central shaft, a female quick-connect fitting, and a socket wrench at a distal end of the shaft. The quick-connect actuator assembly is in operates the female quick-connect fitting. The nozzle fitting is disposed at a proximal end of the central shaft, is in fluid communication with the socket wrench via the hollow central shaft, and is adapted to receive an end of a brake fluid waste line. The quick-connect fitting receives and retains the bleed screw such that the socket fits around a hex fitting on a bleed screw. The wrench loosens the bleed screw causing fluid to flow through the tool and out the nozzle fitting.

A diagnostic method, in particular to determine the leak tightness of at least one seal and/or one valve, for at least one component of a vehicle, wherein a piston cylinder unit, whose piston is driven by an electromotive drive, forms a pressure supply unit, wherein a control unit identifies the piston position and/or piston movement of the piston by means of at least one sensor and the pressure generated by the pressure supply unit or the motor current flowing through the drive by means of at least one sensor. During the diagnostic method, the control unit may be used to measure quantities relating to piston movement/position, pressure, and/or pressure variation.

A tool for bleeding brakes includes a primary assembly, a quick-connect actuator assembly, and a nozzle fitting. The primary assembly has a hollow central shaft, a female quick-connect fitting, and a socket wrench at a distal end of the shaft. The quick-connect actuator assembly is in operates the female quick-connect fitting. The nozzle fitting is disposed at a proximal end of the central shaft, is in fluid communication with the socket wrench via the hollow central shaft, and is adapted to receive an end of a brake fluid waste line. The quick-connect fitting receives and retains the bleed screw such that the socket fits around a hex fitting on a bleed screw. The wrench loosens the bleed screw causing fluid to flow through the tool and out the nozzle fitting.

A brake system for a vehicle such as a bicycle is disclosed. The brake system may comprise an improved master cylinder assembly configured (e.g. manufactured/produced, assembled, etc.) so that a setting and/or adjustment of the brake stroke and/or lever action/actuation can be provided by any one independent mechanism (e.g. without any other adjustment mechanism) or by a combination of adjustment mechanisms (e.g. in a combination with one or more adjustment mechanism); operation of a mechanism for setting and/or adjusting the brake stroke may comprise a feature configured to engage a pushrod (e.g. by direct action on the pushrod or a feature of the pushrod or by indirect action through a link, adjuster, etc. configured to engage the pushrod). The master cylinder assembly may be configured to be set and/or adjusted/tuned within the indicated range to provide an intended performance and/or “feel” for the operator at the brake lever.

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.

A method for controlling the braking power in an electrohydraulic braking system of a transportation vehicle which includes initiating a braking process; detecting a current state of the electrohydraulic braking system; increasing the braking pressure based on the current state of the electrohydraulic braking system, wherein braking pressure is built up more rapidly by targeted, staggered supply of braking pressure to individual parts of the braking system.

A brake system (20) for a vehicle includes a brake unit (20A; 20B) having: a fluid reservoir (32) for containing a volume of brake fluid therein, an ECU (1000), and an electronically-controlled plunger device (60) operable to stroke in response to a control signal from the ECU (1000) to supply fluid pressure to at least one wheel cylinder (RL, RR) for vehicle braking. The plunger device (60) includes: a rod (108) coupled to an actuator (M), a primary seal (100) coupled to the rod (108) and arranged to seal against an inner wall of a plunger chamber, and a secondary seal (104) surrounding the rod (108) to seal an interface where the rod (108) exits the plunger chamber. A portion of the plunger chamber between the primary and secondary seals (100, 104) is coupled through a switchable valve (112) to the fluid reservoir (32). A method of operating a brake system (20) for self-contained brake circuit filling comprises the steps of providing a brake unit (20A; 20B), performing a pressure bleed on a first portion of a brake circuit, supplying pressurized brake fluid to a wheel (RL) coupled to the first portion and supplying brake fluid from a reservoir (32) to a second portion of the brake circuit by switching a valve (112) while using a plunger device (60) under control of an ECU (1000).