Abstract: A hydraulic brake system is adapted to be assembled on a steering assembly. The hydraulic brake system includes a connecting member and hydraulic device. The connecting member has a receiving room and a receiving opening. The hydraulic device has a hydraulic cylinder and a fluid tank. The hydraulic cylinder is received in the receiving room. The fluid tank is inserted in the receiving opening and connected with the hydraulic cylinder. The hydraulic cylinder has a main body, two pistons and two springs. The main body has two hydraulic chambers. The two pistons are assembled in the two hydraulic chambers and two springs sleeve onto the two pistons. Two brake cables and two fluid pipes are connected with the hydraulic cylinder. When the brake cable pulls the piston to press a fluid in the hydraulic chamber, the fluid flows into the fluid pipe so as to control a brake device.

Abstract: A bicycle hydraulic operating device comprises a base member, a piston, and a plug member. The base member is configured to be mounted to a bicycle handlebar and has a cylinder bore and a through-hole. The cylinder bore extends in a first direction. The through-hole includes an outer opening on an outer surface of the base member and extends from the cylinder bore. The piston is configured to be movably disposed within the cylinder bore. The plug member is configured to plug up the through-hole and has an inside part disposed inside the outer opening. The inside part has a maximum outer diameter larger than an inner diameter of the outer opening.

Abstract: In a straddle type vehicle having front forks, the left front fork is in an elliptical shape portion whose axial cross section is formed so as to be wider in the width direction of the vehicle as compared to a length in the front and rear direction at the portion located in front of the brake caliper. The brake caliper is disposed so as to be overlapped with the elliptical shape portion, viewed from the front direction of the vehicle.

Abstract: An adjustment device for a hydraulic brake system includes a hollow casing and a retractable unit. The hollow casing has a rotatable ring to control the retractable unit. One end of the hollow casing is connected to a hydraulic hose, and another end is connected to a hydraulic cylinder. The adjustment device is assembled between a hydraulic hose and a hydraulic cylinder. When a user rotates the rotatable ring, the retractable unit is adjusted so as to control a sensitivity of a hydraulic brake system.

Abstract: A hydraulic brake handle assembly, wherein the response time of the hydraulic brake caliper can be much improved, and the brake action can be carried out immediately. When the brake lever is pressed, the volume of the oil pushed by the piston is doubled due to the hydraulic brake handle assembly is provided with two piston portions inserted in two oil chambers. Since the response time of the hydraulic caliper of the present invention is improved, it allows the brake pads of the hydraulic caliper to be assembled at a relatively large distance from the brake disc, so that sand won't get struck between the brake pads and the brake disc, and the brake disc remains useful when they are bent out of plain rubbing after using.

Abstract: Disclosed herein is an adjustable lever assembly with a lever having an adjustment section and a grip section, where the adjustment section includes a slide passage in communication with an adjuster passage, and an adjuster positioned at least partially inside the adjuster passage, the adjuster having a threaded inner passage extending therethrough. The adjustable lever assembly further includes a slide positioned substantially inside the slide passage, the slide including an outer wall surface that is keyed to the slide passage and a threaded outer portion for rotatably engaging the threaded inner passage of the adjuster, wherein rotation of the adjuster translates the slide about the adjuster passage, and wherein the slide includes a bottom portion configured for securing pivotally to a pushrod.

Abstract: A bicycle hydraulic operating device comprises a bracket, a hydraulic cylinder, a piston, a lever, a fluid reservoir, and a lid. The bracket is configured to be mounted to a bicycle handlebar. The piston is movably disposed within the hydraulic cylinder. The lever is pivotally provided around a pivot axis relative to the bracket and is operatively coupled to the piston to move the piston within the hydraulic cylinder in response to pivotal movement of the lever. The fluid reservoir is disposed on the bracket and having an opening configured to face substantially in a downward direction in a state where the bracket is mounted to the bicycle handlebar. The lid is configured to cover the opening of the fluid reservoir.

Abstract: In a brake system for a vehicle, a first control mode and a second control mode are provided by which it is possible to cope with variations in the running environments such as changes between traveling on a public road and traveling on a circuit racecourse and variations in road conditions such as changes between a dry road surface and a wet road surface. A mode change-over switch is disposed between a kill switch on the upper side and a starter switch on the lower side, on the vehicle body center side relative to a right grip. Switching between the first control mode and the second control mode is carried out by use of the mode change-over switch.

Abstract: A hydraulic pump including a containment body (2) having inside a cylindrical cavity (3) provided with a conduit (4) communicating with a hydraulic actuator and capable of holding a fluid. A piston (5) is movable in the cylindrical cavity (3) and a reservoir (12) of the fluid is in fluid communication with the cylindrical cavity (3). An actuation device (6) connected to the piston (5) move the piston (5) within the cylindrical cavity (3) to operate the hydraulic actuator. The pump also comprises structure (13) for closing or opening the connection between the reservoir (12) and the cylindrical cavity (3). The reservoir (12) is substantially lined up with the cylindrical cavity (3) along an axis of longitudinal development (X) of same cylindrical cavity (3), so as to reduce the overall dimensions and the weight of the pump.

Abstract: A bicycle hydraulic component operating device has a main body, a hydraulic cylinder, a piston, an operating lever, a fluid reservoir tank, and a communication port. The main body includes a handlebar mounting portion and a gripping portion. The piston is movably disposed within the hydraulic cylinder. The operating lever is pivotally disposed around a pivot axis relative to the main body. The operating lever is operatively connected with one of the hydraulic cylinder and the piston to generate a hydraulic force in response to pivotal movement of the operating lever relative to the main body. The fluid reservoir tank is in fluid communication with the hydraulic cylinder. The communication port is in communication with the fluid reservoir tank.

Abstract: A hydraulic brake controller does not only dispose a first oil-return hole, which is connected to an oil storing space, at a stroke place of allowing a piston to reciprocate in a main oil cylinder, but also disposes a regulating screw, which stretches the first oil-return hole, on a controller main body. The speed of returning hydraulic oil to the oil storing space can be controlled by simply changing the degree of the regulating screw stretching the oil-return hole so that time of allowing the piston passing through the oil-return hole to completely impose the braking force on the brake pad can be extended or reduced, thereby achieving a goal of conveniently regulating the braking sensitivity.

Abstract: An adjustable holder of a hydraulic brake device for a bicycle which is assembled on a steering tube and is located between a stem and a head part includes a holder, a first adjusting member and a second adjusting member. The holder has a fixing portion and a fastening portion defined at two ends thereof respectively. A hydraulic brake device is assembled to a bottom of the holder. The fastening portion has a fastening hole opened therethrough. The fastening hole sleeves onto the steering tube. One end of the first adjusting member and one end the second adjusting member are abutted against two ends of the fastening hole respectively. Therefore, an angle between the holder and the steering tube is adjustable, which corresponds to an elevation angle of the stein.

Abstract: A brake device for a vehicle includes a brake pedal rotatably supported on a support shaft and extending in a front ward direction from the support shaft in the longitudinal direction of the vehicle. A master cylinder is located on the rear side of the support shaft in the longitudinal direction of the vehicle for generating a braking hydraulic pressure according to the rotational operation of the brake pedal. An operational amount detector is mechanically connected to the brake pedal for detecting the rotational amount of the brake pedal. The master cylinder includes an axis that is arranged vertically and is located above the support shaft with the operational amount detector being located on the rear side of the support shaft in the longitudinal direction of the motorcycle. Thus, the master cylinder and the operational amount detector can be densely arranged in the longitudinal direction of the vehicle.

Abstract: A hydraulic brake device includes a main body, a brake lever, a hydraulic rod, a connecting rod, a sleeve member and an elastic member. The elastic member has an assembling portion, a driving portion and a deformation portion. When a user actuates the brake lever suddenly and forcefully, the driving portion of the elastic member moves toward the hydraulic room; a pressure of hydraulic oil pushes the driving portion so as to indirectly force the deformation portion to deform and bend, so that the deformation portion and the driving portion slightly move toward the assembling portion; thereby, a volume of hydraulic oil is smoothly pushed into a brake caliper through a hydraulic pipeline, such that the user brakes a bicycle stably, smoothly and safely.

Abstract: A control lever including a body portion, a mounting portion, at least one mounting screw, and a lever portion. The body portion has a first section configured to fit within an interior of a bar opening, where the first section is configured to house at least a portion of a control mechanism and has an inclined surface on an outer surface thereof. The mounting portion is configured to slide on the inclined surface, and the mounting screw connects the mounting portion to the body portion. The lever portion is connected to the body portion and is configured to actuate the control mechanism. The mounting screw is configured to slide the mounting portion along the inclined surface so as to push the mounting portion and a side of the first section against an inner surface of the bar opening in order to mount the body portion to the bar opening.

Abstract: A hydraulic brake master cylinder includes a cylinder unit having first and second spaces, a channel communicating the spaces and an adjuster exposed outside; a piston slidably disposed in the first space; a first spring applying an elastic force to the piston; a rod moving relative to the piston; a second spring applying an elastic force to the rod; a seal attached to the rod and moving controllably to seal the channel; and a nut threaded onto the rod. The adjuster is rotatable to make the nut and the rod rotate with respect to each other so as to change the distance between the seal and the end of the channel to adjust the free stroke.

Abstract: A hydraulic brake adjusting device is provided. The mechanical advantage may be automatically increased by pressed the handlebar by riders and then increased the angle lead by the leading plate(s). Thereby, it may simplify structure, be easy to operate, and be capable of automatically adjusting mechanical advantage while riding. Furthermore, the distance between the O-ring on the tube and the through hole of the piston may be adjusted by the screw barrel to make the convex portion push against the tube, the piston, and the push rod.

Abstract: A hydraulic brake master cylinder is provided. The end of the movable barrel away from the outer convex ring is spaced apart or against the first inner convex flange and to adjust the location of one of two flow-through holes to make the use of brake not be influenced by the oil and air inside the first cylinder while rotating the movable barrel through the disposed outer convex ring. Two elastic plates are plugged in the inner conical portion, the outer convex ring between two ends of the inner connecting member is against the third inner convex flange adjacent to the fifth inner threaded portion, and two elastic plates are pressed by the inner conical portion to be fastened and passed through the second end cap, the second piston, the first piston, and the end of the two elastic plates with a brake cable in series.

Abstract: A standard foot-operated rear brake system on a motorcycle is converted to a hand-operated brake assist system by mounting a pneumatic cylinder in close proximity to the rear brake foot pedal such that, when pressurized, the piston of the pneumatic cylinder extends to depress the rear brake foot pedal. The pneumatic cylinder is controlled by a switch on the handlebar.

Abstract: A hydraulic brake mechanism is described including a housing. A master cylinder assembly is disposed within the housing, and the master cylinder assembly includes a fluid chamber. The fluid chamber includes a first chamber portion having a first diameter and a second chamber portion having a second diameter, with the first diameter greater than the second diameter. The fluid chamber includes a transition region between the first and second chamber portions. The mechanism includes a piston assembly having a piston disposed within the fluid chamber. A first seal is configured to sealingly engage between the first chamber portion and the piston, and a second seal is configured to sealingly engage between the second chamber portion and the piston. The mechanism includes an outlet port extending from the fluid chamber from or adjacent the transition region.

Abstract: A hydraulic brake device for a bicycle includes a holder, a chamber member and two side oil tubes, the holder assembled with the bicycle, the chamber member assembled to the holder and having two oil tanks, each oil tank having an operating bar movably received therein, the brake cable connected with the operating bar, each oil tank having a brake oil drain and a side oil hole, a distance being defined between each brake oil drain and each corresponding side oil hole, each brake oil drain and each side oil hole communicating with the chamber member, each brake oil drain assembled to a brake hose and communicating with a brake system of the bicycle, the chamber member having two assembling grooves, two ends of each side oil tube assembled to each corresponding side oil hole and each corresponding assembling groove respectively.

Abstract: A hydraulic brake lever apparatus is provided with a brake lever housing, a piston, a mounting structure, a brake lever and a fluid reservoir. The brake lever housing includes a cylinder having the piston movably disposed within the cylinder. The mounting structure mounts the brake lever housing to a bicycle handlebar. The brake lever pivotally is mounted to the brake lever housing and moves the piston within the cylinder in response to pivotal movement of the brake lever relative to the brake lever housing. The fluid reservoir fluidly communicates with the cylinder via a port that communicates hydraulic fluid therebetween. The fluid reservoir has a cylindrical shape and lies in a side by side relationship with the cylinder to prevent gas bubbles that have moves from the cylinder to the fluid reservoir via the port from flowing back to the cylinder.

Abstract: A hydraulic pump comprising a containment body (2) having inside a cylindrical cavity (3) provided with a conduit (4) communicating with a hydraulic actuator and capable of holding a fluid. A piston (5) is movable in the cylindrical cavity (3) and a reservoir (12) of the fluid is in fluid communication with the cylindrical cavity (3). Actuation means (6) connected to the piston (5) move the piston (5) within the cylindrical cavity (3) to operate the hydraulic actuator. The pump also comprises means (13) for closing or opening the connection between the reservoir (12) and the cylindrical cavity (3). The reservoir (12) is substantially lined up with the cylindrical cavity (3) along an axis of longitudinal development (X) of same cylindrical cavity (3), so as to reduce the overall dimensions and the weight of the pump.

Abstract: A bicycle hydraulic component operating device has a main body, a hydraulic cylinder, a piston, an operating lever, a fluid reservoir tank, and a communication port. The main body includes a handlebar mounting portion and a gripping portion. The piston is movably disposed within the hydraulic cylinder. The operating lever is pivotally disposed around a pivot axis relative to the main body. The operating lever is operatively connected with one of the hydraulic cylinder and the piston to generate a hydraulic force in response to pivotal movement of the operating lever relative to the main body. The fluid reservoir tank is in fluid communication with the hydraulic cylinder. The communication port is in communication with the fluid reservoir tank.

Abstract: A hydraulic brake device for a bicycle includes a holder, a chamber member and two side oil tubes, the holder assembled with the bicycle, the chamber member assembled to the holder and having two oil tanks, each oil tank having an operating bar movably received therein, the brake cable connected with the operating bar, each oil tank having a brake oil drain and a side oil hole, a distance being defined between each brake oil drain and each corresponding side oil hole, each brake oil drain and each side oil hole communicating with the chamber member, each brake oil drain assembled to a brake hose and communicating with a brake system of the bicycle, the chamber member having two assembling grooves, two ends of each side oil tube assembled to each corresponding side oil hole and each corresponding assembling groove respectively.

Abstract: A brake master cylinder of the invention is to dispose a main oil cylinder and an oil storing space on a handlebar base. In addition, a sleeve engaged with the main oil cylinder is disposed in the oil storing space. The one end of the oil storing space has a fastening seat passed by a draw bar linked to the brake handlebar, and a positioning sheath of the fastening seat is utilized to engage with the sleeve. A leakage prevention component is disposed between the fastening seat and the handlebar base. A bushing integrally extended from the leakage prevention component is utilized to encapsulate the positioning sheath of the fastening seat and the sleeve. Accordingly, the brake master cylinder having convenient assembly and better sealing effect for hydraulic oil is obtained.

Abstract: A hydraulic brake mechanism is described including a housing. A master cylinder assembly is disposed within the housing, and the master cylinder assembly includes a fluid chamber. The fluid chamber includes a first chamber portion having a first diameter and a second chamber portion having a second diameter, with the first diameter greater than the second diameter. The fluid chamber includes a transition region between the first and second chamber portions. The mechanism includes a piston assembly having a piston disposed within the fluid chamber. A first seal is configured to sealingly engage between the first chamber portion and the piston, and a second seal is configured to sealingly engage between the second chamber portion and the piston. The mechanism includes an outlet port extending from the fluid chamber from or adjacent the transition region.

Abstract: An apparatus for a bicycle brake comprises a housing with a first piston bore and a second piston bore, a first piston disposed in the first piston bore, a first piston rod attached to the first piston and extending from the first piston toward the outside of the housing for coupling to a first brake arm, and a second piston disposed in the second piston bore. The first piston moves along a first piston axis, and the second piston moves along a second piston axis.

Abstract: A hydraulic brake master cylinder includes a cylinder unit having first and second spaces, a channel communicating the spaces and an adjuster exposed outside; a piston slidably disposed in the first space; a first spring applying an elastic force to the piston; a rod moving relative to the piston; a second spring applying an elastic force to the rod; a seal attached to the rod and moving controllably to seal the channel; and a nut threaded onto the rod. The adjuster is rotatable to make the nut and the rod rotate with respect to each other so as to change the distance between the seal and the end of the channel to adjust the free stroke.

Abstract: A hydraulic brake handle assembly, wherein the response time of the hydraulic brake caliper can be much improved, and the brake action can be carried out immediately. When the brake lever is pressed, the volume of the oil pushed by the piston is doubled due to the hydraulic brake handle assembly is provided with two piston portions inserted in two oil chambers. Since the response time of the hydraulic caliper of the present invention is improved, it allows the brake pads of the hydraulic caliper to be assembled at a relatively large distance from the brake disc, so that sand won't get struck between the brake pads and the brake disc, and the brake disc remains useful when they are bent out of plain rubbing after using.

Abstract: An actuator unit for a hydraulic brake mechanism on two-wheelers, comprising a housing fastened to the handlebar, a brake cylinder being arranged substantially perpendicular to the handlebar in the housing, a piston movable in it and a brake lever acting on the piston at an intermediate portion remote from either end of the lever, the lever being mounted at one end thereof to rotate relative to the housing, wherein the brake lever is mounted adjustably movable with respect to an axis substantially at an end of the lever, the axis being unchangeable in position but rotatably mounted to the housing, the adjustment option being provided for by the adjustment mechanism, wherein the lever, the adjustment mechanism and the axis rotate together relatively to the housing upon operation.

Abstract: A hydraulic brake device includes a carrier body. The carrier body is integrally molded. The carrier body has at least one assembling portion disposed thereon for assembling purpose. The carrier body has at least one connecting portion respectively extending from the at least one assembling portion. At least one hydraulic brake assembly movably is mounted on the at least one connecting portion of the carrier body. The carrier body with the at least one brake assembly are adapted to assemble with a bicycle for providing a stable assembling effect, a high structural strength, and lightweight effect.

Abstract: A hydraulic bicycle component includes a first section and a first seal rupturing structure. The first section defines a first fluid path. The first seal rupturing structure is disposed in the vicinity of the first fluid path. The first seal rupturing structure is configured to physically rupture a first seal of a first hydraulic hose when the hydraulic bicycle component is coupled to the first hydraulic hose.

Abstract: A hydraulic bicycle component kit includes a first hydraulic component and a hydraulic hose. The first hydraulic component has a first fluid path. The hydraulic hose is filled with hydraulic fluid. The hydraulic hose has a first end with a first opening and a first seal that seals the first opening. The hydraulic hose and the first hydraulic component are configured such that the first seal of the hydraulic hose is physically ruptured by a first seal rupturing structure.

Abstract: A hydraulic bicycle component system includes a hydraulic component and a first seal. The hydraulic component has a fluid path filled with hydraulic fluid. The hydraulic component is configured to be coupled to a hydraulic hose. The first seal is arranged to seal an end of the fluid path of the hydraulic component.

Abstract: An actuator mounting, in particular, a clutch or brake mounting for a vehicle, includes a mounting housing (3) with an attachment shell (2) for attaching the mounting to a handlebar or a similar steering element, a hand lever (8) supported to rotate on the mounting housing (3), and a mechanical or hydraulic force transmission device arranged on the mounting housing (3). The actuator mounting includes a carrier plate (9) supported on the rotational bearing (7) in common with the hand lever (8) as an intermediate transmission element with multiple functions. The carrier plate (9) has contact points (16, 32, 34) for applying force to or tensioning the hand lever (8), the force transmission device, and the mounting housing stop (35).

Abstract: A brake operating device of an electric bicycle is provided with a brake lever including a projecting plate at one end, and a bifurcated cable anchoring member pivotably secured to the projecting plate; a magnetic member adhered to one side of the cable anchoring member; a housing pivotably secured to the brake lever and including a hydraulic cylinder and a cylindrical socket including an opening distal the brake lever, and internal threads proximate the opening; a spring depressible sensor including a sensing member disposed in the socket, and an electric wire extending from the sensing member; a hollow threaded fastener adjustably threadedly secured to the internal threads of the socket to engage the sensing member; and a cylindrical member releasably mounted proximate to the opening and secured to the fastener. The electric wire passes the fastener and leaves the housing.

Abstract: A device for adjusting the free stroke for hydraulic brakes of bicycles or motorcycles of the type including a pump assembly (4) for operating an actuator element (16), and a communication line (17) for a working fluid, set between a pump assembly and an actuator element, the device including an expansion chamber (25) set along the communication line between the pump assembly and the actuator element.

Abstract: A hydraulic brake control apparatus for attaching to an open ended handlebar of a vehicle, the handlebar having a longitudinal axis. A brake housing is attachable to the handlebar, the brake housing including a first section residing outside the handlebar and abutting the open end of the handlebar, and a second section sized and shaped to be received inside the handlebar. A master cylinder is disposed within the first section, the master cylinder having a bore with a bore axis that is oriented transverse to said axis of the handlebar and a master cylinder actuator is in operative association with the master cylinder. A micro-adjust mechanism, a macro-adjust mechanism, and a clamp mechanism is also provided.

Abstract: A hydraulic brake device includes a main body, a brake lever, a hydraulic rod, a connecting rod, a sleeve member and an elastic member. The elastic member has an assembling portion, a driving portion and a deformation portion. When a user actuates the brake lever suddenly and forcefully, the driving portion of the elastic member moves toward the hydraulic room; a pressure of hydraulic oil pushes the driving portion so as to indirectly force the deformation portion to deform and bend, so that the deformation portion and the driving portion slightly move toward the assembling portion; thereby, a volume of hydraulic oil is smoothly pushed into a brake caliper through a hydraulic pipeline, such that the user brakes a bicycle stably, smoothly and safely.

Abstract: A bicycle hydraulic operating device is basically provided with a main body, a hydraulic unit, a handlebar mounting structure and a lever. The main body includes a gripping portion. The hydraulic unit is mounted to the main body. The handlebar mounting structure is disposed on one of the main body and the hydraulic unit. The lever is pivotally mounted to one of the main body and the hydraulic unit.

Abstract: A hydraulic brake system is adapted to be assembled on a steering assembly. The hydraulic brake system includes a connecting member and hydraulic device. The connecting member has a receiving room and a receiving opening. The hydraulic device has a hydraulic cylinder and a fluid tank. The hydraulic cylinder is received in the receiving room. The fluid tank is inserted in the receiving opening and connected with the hydraulic cylinder. The hydraulic cylinder has a main body, two pistons and two springs. The main body has two hydraulic chambers. The two pistons are assembled in the two hydraulic chambers and two springs sleeve onto the two pistons. Two brake cables and two fluid pipes are connected with the hydraulic cylinder. When the brake cable pulls the piston to press a fluid in the hydraulic chamber, the fluid flows into the fluid pipe so as to control a brake device.

Abstract: An adjustment device for a hydraulic brake system includes a hollow casing and a retractable unit. The hollow casing has a rotatable ring to control the retractable unit. One end of the hollow casing is connected to a hydraulic hose, and another end is connected to a hydraulic cylinder. The adjustment device is assembled between a hydraulic hose and a hydraulic cylinder. When a user rotates the rotatable ring, the retractable unit is adjusted so as to control a sensitivity of a hydraulic brake system.

Abstract: A brake operating device of an electric bicycle is provided with a brake lever; a housing comprising a pivot portion pivotably secured to the brake lever, a hydraulic cylinder, a piston disposed in the hydraulic cylinder and having one end connected to the brake lever, a spring depressible magnet disposed in the hydraulic cylinder and having one end adhered to the other end of the piston, and a cylindrical socket adjacent to and parallel to the hydraulic cylinder; a spring depressible Hall-effect sensor disposed in the socket and including a Hall IC; a hollow fastener adjustably threadedly secured to an opening of the socket and engaging the Hall-effect sensor; and a control line inserted through the fastener to electrically connect to the Hall IC.

Abstract: A brake operating device of an electric bicycle is provided with a brake lever including a projecting plate at one end, and a bifurcated cable anchoring member pivotably secured to the projecting plate; a magnetic member adhered to one side of the cable anchoring member; a housing pivotably secured to the brake lever and including a hydraulic cylinder and a cylindrical socket including an opening distal the brake lever, and internal threads proximate the opening; a spring depressible sensor including a sensing member disposed in the socket, and an electric wire extending from the sensing member; a hollow threaded fastener adjustably threadedly secured to the internal threads of the socket to engage the sensing member; and a cylindrical member releasably mounted proximate to the opening and secured to the fastener. The electric wire passes the fastener and leaves the housing.

Abstract: A master device for a closed hydraulic system of handlebar-steered vehicles includes a basic body and a pressure chamber in which, in the event of actuation of the master device in order to actuate a slave device, hydraulic fluid is placed under pressure. The master device includes a hydraulic line connecting element having a connecting piece for connecting a hydraulic line and a thread section for screwing into the basic body. An air bleed opening bleeds the hydraulic system. The hydraulic line connecting element and the basic body form a valve that closes the connection between the pressure chamber and the air bleed opening when the hydraulic line connecting element is fully screwed in to the basic body.

Abstract: A bicycle brake operating device is provided with a housing on a handlebar and including a channel, first and second holes, a fluid reservoir, and a reservoir cover on the fluid reservoir; a brake transmission mechanism in the channel; a hydraulic brake lever including a stepped-diameter tunnel and a push member engaging the spring actuated mechanism; and a pivot assembly including a first retaining member including a sleeve disposed in the first hole and having one end engaging the reservoir cover, and an annular flange at the other end of the sleeve and engaging an inner surface of the tunnel; a second retaining member including a cup in the second hole and having a bottom through hole, and an annular flange around mouth of the cup, the flange engaging the inner surface of the tunnel; and a cylindrical pivot in the first and second retaining members and the tunnel.

Abstract: A hydraulic brake is used to a handle of a two wheel vehicle and contains a body including two first tabs, the handle including an axial hole and a through bore to receive an adjustable nut having a screw aperture to be screwed with first threads of a connecting post of a hydraulic piston, the body including a retaining sleeve and two second tabs, a hydraulic cylinder including an oil chamber and fitted to a holder, a positioning nut having an orifice screwed with second threads of the hydraulic cylinder, the holder including a receiving room to receive an oil cup, a pore, and a cover, an outer diameter of the pore of the holder being equal to that of the hydraulic cylinder, the hydraulic piston including the connecting post, and the connecting post including the first threads to screw the connecting post with the orifice of the positioning nut.

Abstract: A hydraulic brake mechanism is described including a housing. A master cylinder assembly is disposed within the housing, and the master cylinder assembly includes a fluid chamber. The fluid chamber includes a first chamber portion having a first diameter and a second chamber portion having a second diameter, with the first diameter greater than the second diameter. The fluid chamber includes a transition region between the first and second chamber portions. The mechanism includes a piston assembly having a piston disposed within the fluid chamber. A first seal is configured to sealingly engage between the first chamber portion and the piston, and a second seal is configured to sealingly engage between the second chamber portion and the piston. The mechanism includes an outlet port extending from the fluid chamber from or adjacent the transition region.

Abstract: A bolt for use with a hydraulic disc brake caliper. The bolt includes a head and a shaft extending outwardly from the head. The shaft includes a threaded portion having a diameter, at least one channel defined at least partially in the outer surface of the threaded portion, and a reduced diameter portion defined at least partially circumferentially around the shaft and located between the head and the threaded portion. When the bolt is threaded into an opening, the at least one channel and the reduced diameter portion are in fluid communication.