Abstract: A combined hydropneumatic brake cylinder/air reservoir device having a hydraulic piston formed on the end of a push rod through which interconnected, different sized, pneumatic pistons operate to transmit the desired brake force. The hydraulic piston operates in a hydraulic cylinder having a slack adjuster piston arranged to supply or reduce the hydraulic fluid in the braking circuit in order to compensate for overtravel and undertravel of the pneumatic piston assembly due to brake shoe wear and brake shoe replacement respectively. The double-acting slack adjuster action results in the stroke of the pneumatic piston assembly being maintained constant to assure continued optimum operating efficiency.

Abstract: A hydraulic reservoir in a tandem master cylinder includes a main portion defining a fluid reservoir chamber for reserving brake fluid, two fluid supply portions defining fluid paths under the main portion, the fluid supply portions being contiguous with the main portion and an opening formed at the top, the two fluid supply portions being connected to two fluid connection portions of a tandem master cylinder body.

Abstract: A hydraulic control apparatus, more particularly for operating a motor vehicle clutch release mechanism, comprising a master cylinder, a slave cylinder and a conduit connecting the master cylinder to the slave cylinder. The apparatus is in the form of separate modular units which are separately filled with hydraulic fluid, and the filled modular units are shipped unconnected to a user. Each modular unit is provided with a leakproof quick-connect connector member, through which filling of the modular unit may be effected, and which mates with a complementary leakproof quick-connect connector member of another modular unit, such that after installation on a utiization device, a motor vehicle for example, complementary connector members are reconnected, thus opening ports in each connector member placing each member in fluid communication with the other. Preferably, the two connector members are provided with a one-way locking arrangement preventing separation of the connector members after coupling.

Abstract: A master cylinder includes a housing movably supporting a pair of pistons and carrying a fluid reservoir assembly. The fluid reservoir assembly carries a differential area piston and a float which cooperate to activate a single reed switch, thereby generating a warning signal for a vehicle operator.

Abstract: A reservoir tank includes a cap, a strainer, and a cap seal which is attached to the cap so as to prevent hydraulic fluid in the reservoir tank from leaking out. The cap seal is integrally formed with a cylindrical projection which is adapted to be pressed in resilient engagement with the outer periphery of the strainer, so that an inner space within the strainer defined by the inner side of the cap, the cap seal, the wall of the strainer, and the surface of the hydraulic fluid is separated by the projection from an outer space defined by the wall of the reservoir tank, the wall of the strainer and the surface of the hydraulic fluid. A tip of the projection of the cap seal is lower than the lower end of a thread portion of the cap when the cap engages with the reservoir tank. Therefore, hydraulic fluid adhering to an inner part of the cap and the cap seal does not drip and adhere to the thread portion of the cap.

Abstract: A valve having a body with an inlet duct, an outlet duct and a plug rotatably disposed in the body. The plug has a port to provide for fluid communication between the inlet and outlet ducts and is movable between an open position wherein the port at least partially registers with both the inlet and outlet ducts to pass fluid through the valve to a closed position wherein no part of the port registers with the ducts, thereby preventing fluid from passing through the valve. The valve has a pressurizable seal between the body and plug, when the plug is at both the open and closed positions. To actuate the seal, a closed hydraulic system is provided. A regulator piston is urged against the pressure of the hydraulic system with a preselected force to regulate the hydraulic pressure. The valve also includes a mechanism to compensate for hydraulic fluid thermal expansion.

Abstract: An improved pneumatic-hydraulic actuated single action pull type installation tool for installing pull type fasteners is disclosed which includes a continuously pressurized fluid reservoir operative to maintain a minimum positive pressure on the hydraulic circuit during operation so as to protect the integrity of the hydraulic circuit during normal operating pressure fluctuations and to reduce the possibility of air being drawn into the hydraulic system during sudden pressure drops in the actuating pressure chamber which may occur at the time the pintail portion is separated from the fastener. Further, the reservoir provides a source of make up hydraulic fluid to replace any fluid which may be lost due to leakage. Suitable valves are provided to enable the reservoir to selectively communicate with both driving and return portions of the hydraulic circuit while still enabling selective pressurization thereof.

Abstract: An inlet assembly for a brake master cylinder including an inlet member made of synthetic resin installed in the cylinder body of the master cylinder for connecting with a hose communicated with a reservoir installed in a vehicle body. The inlet member includes a first member integrally forming a first tubular portion on a cylinder body side of the inlet member which is fitted into an inlet portion of cylinder body, a second tubular portion for operative engagement with the hose, and a second member having a mounting portion for mounting on the cylinder body, the first member being integrally connected with said second member by heat welding or a similar form of connection.

Abstract: The die-casting mold and the die-cast brake master cylinder housing comprise an axial master cylinder piston bore and a compensating bore, whose latter axis extends parallel to the axis of the master cylinder piston bore. The compensating bore has one end terminating in a compensating reservoir port oriented transversely relative to the housing's longitudinal axis and its other end terminating in a sealing chamber that is formed by an extension of the master cylinder piston bore. To render the casting process for manufacturing a die-cast brake master cylinder housing simpler, the mold comprises a core for the compensating bore whose longitudinal cross-sections containing the longitudinal axis are of conical construction, with the narrowest point being adjacent to the compensating reservoir port and whose cross-sections extending vertically to the longitudinal axis are of substantially reniform construction, while the concave sides of the cross-sections are close to the master cylinder piston bore.

Abstract: A diaphragm assembly is designed to follow a drop in the level of a working fluid filled in a reservoir used with a master cylinder for the purpose of cutting off the communication between the working fluid and the outside air. The diaphragm includes a pair of opposite lower steps in the axial direction. Each of the steps comprises an upright flat portion and an upper flat portion which form parts of the bottom wall and side wall of the diaphragm, when the level of the working fluid in the reservoir reaches a predetermined lower limit. The upper flat portions of the steps are inclined to at a given angle to the horizontal, thus forming an air passage.

Abstract: A hydraulic valve device for a hydraulic circuit controlling clutches, brakes and similar mechanisms comprises a non-return valve provided between a tank and a chamber. The non-return valve incorporates a ball accommodated in a cylindrical cavity and interacting with a leak-proof seat located on the same side as the tank, and a permeable seat located on the same side as the chamber. This arrangement eliminates the risk of the hydraulic liquid in the tank overloading the circuit during abrupt depressurization of the circuit.

Abstract: A reservoir assembly comprises a pair of cup-shaped housing members each made of thermoplastic resin and having an opening end, the housing members being integrally secured by heat welding to each other at their opening ends, and a partition plate arranged within the housing members to subdivide the interior of the reservoir assembly into two chambers. In the reservoir assembly, one of the housing members is formed at the opening end portion thereof with a stepped inner wall which is coupled with the outer periphery of the partition plate in such a manner that the partition plate is positioned inside the opening end of the housing member and fastened in place by an annular bead which is radially inwardly extruded at the opening end of the housing member during the heat welding process.

Abstract: A hydraulic reservoir for tandem master cylinder includes a body formed by upper, lower and side walls, two brake fluid reserving chambers formed by two partitioning walls in the body, and oblong passages formed by the side walls and ancillary walls integrally formed with the partitioning walls to make the two brake fluid reserving chambers communicate with each other, the oblong passages being open to the two brake fluid reserving chambers, respectively, having bottoms higher by a predetermined length than the lower wall, and having at least such length that a flow amount of brake fluid between the two brake fluid reserving chambers is limited to a predetermined value on the inclination of the brake fluid level relative to the body.

Abstract: In a reservoir tank which includes an oil seal mounted to the cap of the reservoir tank and adapted to be in resilient engagement against the inner peripheral surface of the reservorir tank, the oil seal is integrally formed with an annular projection the tip portion of which is positioned at the braking fluid side of the cylindrical portion of the cap.

Abstract: A liquid reservoir for a hydraulic master cylinder, having a body with a detachable cap for refilling the reservoir, and a diaphragm secured in position by the cap and dividing the reservoir into an air chamber, vented to atmosphere via a hole in the cap and a liquid chamber connected to the master cylinder. An inlet port is provided in the wall of the reservoir for initial charging of the liquid into the liquid chamber without removal of the cap, the port being closed by a plug after the liquid reservoir has been filled. The method of filling a hydraulic control system which has such a reservoir is by the application of vacuum to the system via the inlet port, introducing liquid into the system through the port and subsequently sealing the port with the plug.

Abstract: A plastic compensating reservoir for hydraulic brake systems, such as for brake systems of automotive vehicles, is provided with two interconnected brake fluid chambers which are in communication each other over one port for connection to each one pressure chamber of a tandem master cylinder. To enable manufacture of a like compensating reservoir by one single injection molding process, there is provided a tube which extends transversely to the reservoir's vertical axis and which projects from one of the brake fluid chambers, the said projecting end being adapted to be closed.

Abstract: A liquid reservoir for a hydraulic master cylinder, having a body with a detachable cap for refilling the reservoir, and a diaphragm secured in position by the cap and dividing the reservoir into an air chamber, vented to atmosphere via a hole in the cap and a liquid chamber connected to the master cylinder. An inlet port is provided in the wall of the reservoir for initial charging of the liquid into the liquid chamber without removal of the cap, the port being closed by a plug after the liquid reservoir has been filled. The method of filling a hydraulic control system which has such a reservoir is by the application of vacuum to the system via the inlet port, introducing liquid into the system through the port and subsequently sealing the port with the plug.

Abstract: A fluid reservoir for supplying fluid to a master cylinder arranged in hydraulic system of an automotive vehicle comprises a reservoir tank having at least one fluid chamber therein and is provided at lower portion thereof with at least one outlet which is offset from a center of the fluid chamber and supplies fluid within the fluid chamber to the master cylinder. The fluid chamber is divided by partition wall into larger and smaller chambers the latter of which is in free fluid communication with the outlet and is in free fluid communication at top thereof with the larger chamber. The smaller chamber is much smaller than larger chamber in both longitudinal and transverse directions of the vehicle. The partition wall is provided with a passage for establishing a restricted normal fluid communication between the larger and smaller chambers.

Abstract: A stationary pressure bleed stem and a movable pressure bleed stem are mounted on a base plate to adjust for varied spacing between the master cylinder ports at the reservoir bottom. The fixture is clamped over the master cylinder reservoir. The stems may be interchangeable with other similar stems of various dimensions to accommodate for variations in dimensions of different master cylinders. The device simplifies and expedites pressure bleeding of master cylinders having different configurations.

Abstract: A master cylinder for hydraulically actuated brakes for automotive vehicles includes at least one master cylinder piston with a piston return spring anchored by a central clamping member and a valve body which is slidable relative to the master cylinder piston and which opens a compensating port in the master cylinder piston when the return spring is relieved. The valve body carries an elastic sealing element at its end face close to the compensating port. The outer diameter of the elastic sealing element is greater than the diameter of the compensating port. A pin shaped on the valve body extends through the sealing element and is adapted to plunge into the compensating port on approach of the valve body to the piston end surface which surrounds the compensating port, thus preventing the sealing element from penetrating into the compensating port.

Abstract: A hydraulic fluid reservoir for automobile including a plurality of fluid chambers separated by a partition, the fluid chambers being communicated with hydraulic systems in the automobile respectively, and a baffle plate between the upper end of the partition and an inlet at the upper portion of a reservoir body to define openings of the respective fluid chambers at predetermined ratios which define the flow rates of fluid into respective fluid chambers.

Abstract: A hydraulic fluid reservoir for automobile including a partition wall within a reservoir casing defining a float chamber and extending from the bottom of the reservoir casing, a float which is movable in said float chamber so as to cause a switch to close or open at a predetermined float level, a communication opening communicating the float chamber with the outside chamber of the partition wall at the lower portion thereof and a fluid reflection cover disposed on the float chamber, malfunction of the level detector is avoided.

Abstract: A master cylinder includes a housing (12) with a bore (14) receiving a pair of pistons (32, 34). A bearing (50) extends from the housing (12) to one of the pistons (32) to define a passage (65) communicating fluid to a pressure chamber (40). The bearing (50), the passage (65) and the pressure chamber (40) extend outwardly of the housing bore (14) to permit the length of the housing to be reduced.

Abstract: A reservoir assembly for a master cylinder includes a housing with a surface adapted to interface with the reservoir assembly. The reservoir assembly comprises a first part made from a lightweight plastic material and a second part made from a metallic material. The second part is adapted to fit on the surface while attachment of the reservoir assembly to the housing is provided for by the second part.

Abstract: In a tandem type brake master cylinder having a body formed with coaxial large and small cylinder bores, a first piston member having a large land sliding in the large bore and a first small land sliding in the small bore, a second piston member having second and third small lands sliding in the small bore, a first chamber defined between the large land and the first small land, a second chamber defined between the first and the second small lands, a third chamber defined between the third small land and a closed end of the small bore, a first spring biasing the first and second piston members apart, a second spring biasing the second piston member away from the closed end of the small bore, first and second outlets opening from the second and third chambers respectively, and a means to allow fluid to pass from the first chamber to the second chamber but not back, a means is provided to prevent the first piston member and the second piston member from becoming separated by a distance greater than a certain pr

Abstract: A two-stage, hydro-pneumatic actuator suitable for use as a railway vehicle brake. The hydraulic cylinder comprises a large diameter bore in which a low- and a high-pressure piston operate jointly during a first stage of operation to effect a high volumetric displacement of hydraulic fluid via a small diameter bore in order to take up the clearance between the brake shoes and wheel. As the brake shoes contact the wheel, the high-pressure piston enters the small bore to interrupt further displacement of hydraulic fluid from the large bore. The force of the high-pressure piston alone during this second stage of operation produces the required brake forces with a high multiplication factor. Make-up fluid is drawn into a chamber on the backside of the low-pressure piston during a brake application stroke an amount corresponding to the over-travel of the high-pressure piston and is subsequently discharged into the hydraulic cylinder during retraction of the brakes to compensate for brake shoe wear.

Abstract: A master cylinder includes a housing (22) with a bore (24) for receiving a pair of pistons (36, 38). The housing defines a reservoir (28) with an outer wall (26). The housing also defines at least one outlet passage (62, 66) communicating fluid from the bore (24) to a brake assembly (16). The outlet passage (62, 66) is partially defined by a boss (60) formed integrally with the housing (22) and the boss (60) cooperates substantially with the outer wall (26) to separate the reservoir (28) into a pair of cavities (84, 86).

Abstract: A master cylinder includes a sleeve (31) which defines fixed positions for a pair of seals (30, 32). A pair of pistons (36, 38) cooperate with the seals (30, 32) to form pressure chambers (40, 42) which communicate fluid pressure to brake circuits during braking. A bearing member (44) cooperates with one (36) of the pistons to define an auxiliary pressure chamber (50) and the bearing member (44) is provided with an additional passage (140) for communicating fluid into and out of the auxiliary pressure chamber as well as an end (46) directing movement of the one piston (36).

Abstract: A fluid reservoir for use with a tandem master cylinder is divided into two compartments by a partition wall with one of the two compartments being directly connected to a first outlet port connected to the master cylinder and the other of the two compartments being connected to a second outlet port connected to the master cylinder disposed in the one of the two compartments by a channel formed within the reservoir extending from the other of the two compartments through the partition wall to the second outlet port. This construction ensures the freest possible arrangement of the first and second ports at the bottom of the reservoir.

Abstract: Friction clutch release apparatus for a motor vehicle comprises a driver-operable master cylinder, a slave cylinder and a conduit which connects the master outlet to the slave cylinder inlet. A liquid reservoir communicates with the bore of the master cylinder between the piston and the outlet when the piston is retracted and has a vent port. The apparatus is assembled, filled with liquid and bled before being installed on the motor vehicle. The vent port may be closed temporarily for convenience of transport and storage after the apparatus is bled, for example by use of a suitable removable closure device which would be removed after installation of the apparatus on the motor vehicle, or may include a movable wall within the reservoir chamber by which liquid within the chamber is separated from that part of the chamber with which the vent port communicates.

Abstract: A master cylinder assembly has a reservoir mounted on the master cylinder body. The reservoir includes a reservoir body having a top opening and a cap attached to the reservoir body for covering the top opening. Between the reservoir body and the cap, there is disposed a flexible diaphragm which also covers the top opening of the reservoir body. A depressing plate is provided between the cap and the diaphragm for forcing the peripheral portion of the diaphragm against the reservoir body when the cap is attached to the reservoir body. Projection and aperture arrangements are provided between the diaphragm and the depressing plate so that they can be held together. The cap is formed with hook-shaped portions for engagement with the outward edge of the depressing plate. The cap, the depressing plate and the diaphragm can be assembled together before they are installed on the reservoir body.

Abstract: A fluid reservoir for a tandem master cylinder. The fluid reservoir is of a type having therein, as one unit body, two chambers each for supplying hydraulic fluid to each of two pistons of the tandem master cylinder. These two chambers are separated into the right and left sides in the reservoir by at least one partition wall extending longitudinally of the cylinder. The bottom of each chamber is inclined to slope down longitudinally of the cylinder and its fluid outlet communicating with the cylinder is formed at the lowest part of the bottom. A fluid warning device and fluid passages connecting the two chambers are located near a vertical plane passing through the center of mass of the hydraulic fluid in the reservoir and extending laterally of the cylinder.

Abstract: In a fluid reservoir for a brake master cylinder, a cap member of elastic material is coupled over the upper opening of a casing, and a diaphragm seal member is coupled within the cap member to subdivide the interior space of the casing into upper and lower chambers. The seal member is provided at its outer periphery with an inlet check valve assembly and at its inner periphery with an outlet check valve assembly. The inlet check valve assembly is characterized by an annular valve seat in the form of a lower stepped portion in the cap member, a cylindrical retainer secured to the outer periphery of the seal member and having an annular flange facing to an upper stepped portion in the cap member, an annular lip of elastic material integral with the flange of the retainer, and a spring loading the retainer toward the upper stepped portion.

Abstract: The invention relates to a two-compartment reservoir for liquid, comprised of two superposed parts and provided with a transfer channel which opens into both compartments and which runs parallel to the plane of the liquid contained in the reservoir.The junction plane of the two parts of the reservoir is inclined, with respect to the bottom of each of them, at an angle ".alpha./2", which permits to manufacture with the same parts two types of reservoirs: the first one for horizontal installation and the other one for inclined installation, at an angle ".alpha.".Suitable grooves, provided in the walls, of the two parts cooperate in both cases to form the transfer channel parallel to the plane of liquid.The invention is particularly useful in hydraulic braking systems for automotive vehicles.

Abstract: A master cylinder assembly includes a body in which fluid pressure is developed. A fluid reservoir is detachably attached to the sides of the body. Fluid communication between the fluid reservoir and the body is provided through one of the sides of the body.

Abstract: A master cylinder and reservoir assembly comprises a reservoir (2) having a depending foot portion (13). For ease of assembly of the reservoir on the master cylinder (1), the foot portion (13) has opposed laterally extending projections which slide in complementary longitudinal recesses (12) at the top of the master cylinder. The reservoir may be held in place by friction, or some arrangement for positively retaining the reservoir may be provided.

Abstract: In a fluid reservoir for a brake master cylinder, a cap is coupled over the upper opening of a reservoir casing, and an extendable diaphragm seal member is coupled in a fluid-tight manner within the casing to subdivide the interior space of the casing into upper and lower chambers. The cap is provided at its center with a vertical rod extending into the casing and having a pair of axially spaced recesses at its intermediate portion, the seal member is provided at its inner periphery with an annular valve part movable along the intermediate portion of the rod and cooperating with the recesses to permit the flow of air to and from the lower chamber, and the valve part is normally retained between the recesses to close the lower chamber.

Abstract: A master cylinder has a housing with a bore therein having a tapered section located between first and second compensator ports connecting the bore to a reservoir. A sleeve locates first and second lip seals adjacent the first and second compensator ports, respectively. A first piston engages the first lip seal and a second piston engages the second lip seal to define first and second chambers within the bore. A bearing member which surrounds the first piston engages the sleeve and holds the first and second lip seals in a stationary position within the bore. Thereafter, an input member moves the first and second pistons past the first and second lip seals to pressurize the fluid in the first and second chambers and provides fluid pressure responsive devices with an operational input through first and second outlet ports in the housing.

Abstract: A sealed type fluid reservoir in which a valve member is incorporated in a main cap which is coupled with an upper end of a casing. The pressure in the interior of the casing is maintained at atmospheric level by the valve member despite pressure variation in the interior of the casing.

Abstract: The invention relates to a fluid reservoir with two compartments, more particularly for supplying hydraulic fluid to tandem master cylinders, this reservoir more specifically comprising two complementary, superjacent parts connected with adhesive, by thermowelding or by any other equivalent method, a central partition attached to the said parts and running across the longitudinal axis of the reservoir to divide the reservoir interior into two compartments having respective outlet orifices, at least one compartment also having a filler orifice, and the two compartments being interconnected by a transfer passage which extends into both of them and runs parallel to the surface of the fluid in the reservoir and substantially at the maximum level for this fluid. The transfer passage enables the hydraulic fluid to pass from one reservoir compartment into the other when the reservoir is filled with hydraulic fluid.

Abstract: A cover for a reservoir of a master cylinder. The housing of the master cylinder has a plurality of vertical slots located in a flange that surrounds the reservoir. Each of the vertical slots is connected to a locking surface by a slanted surface on the flange. A diaphragm has a series of tabs which are located in the slots to align expandable sections thereon with the reservoir. The cover has a lip with a series of detents located in the lip. To attach the cover to the housing, the detents are located in the slots in the flange and a vertical force is thereafter applied to compress the diaphragm between the flange and the cover. A horizontal force then moves the detents from the slots and over the slanted surface to the locking surface to maintain the seal between the housing and the cover.

Abstract: A master cylinder assembly has a low pressure, high volume displacement quick take-up chamber and a high pressure, low volume displacement pressurizing chamber formed by a stepped bore and a stepped piston. A compensation control and blow-off valve unit has a peripheral lip seal type valve providing compensation flow on brake release but preventing flow from the quick take-up chamber during brake apply. A normally closed check valve can open to provide communication between the quick take-up pressurizing chamber and the fluid reservoir. When the pressurizing cup for the high pressure chamber closes its compensation port, the check valve is subjected to the pressure in the quick take-up pressurizing chamber. Initial fluid flow is obtained from the quick take-up chamber past the pressurizing cup into the high pressure chamber.

Abstract: A vehicle brake booster and master cylinder assembly has a vacuum suspended booster section which is controlled by movement of the vehicle brake pedal. A hydraulic booster section is in series with the vacuum suspended booster section, and a master cylinder unit is in series with the hydraulic booster section. The assembly is so arranged that in normal operation the vehicle operator obtains boosted brake actuating pressures by operation of the vacuum suspended booster which acts through the hydraulic booster mechanism without operating the hydraulic booster. When greater brake actuating pressures are required, as indicated by increased brake pedal force exerted by the operator, the vacuum booster reaches its limit or runout condition and the hydraulic booster is operated so as to continue the increase in master cylinder output pressure.

Abstract: The invention relates to motor vehicle reservoir and master cylinder assemblies in which a hydraulic master cylinder can be mounted onto the vehicle in a large number of attitudes with respect to the vehicle without the limitation of maintaining the reservoir in an upright position. The reservoir is mounted directly onto the master cylinder by an adjustable means so that the attitude of the reservoir can be readily selectively adjusted relative to the master cylinder to ensure that the reservoir is substantially upright.

Abstract: A resilient seal cap is coupled over an upper opening of a reservoir casing to define an interior air space with the upper surface of brake fluid in the casing. The seal cap is formed integral with a first annular lip co-operating with the inner wall of the casing to provide an inlet check valve permitting the flow of air into the interior air space and with a second annular lip co-operating with a valve plate secured to the center of the casing to provide an outlet check valve permitting the flow of air out from the interior air space to the exterior.

Abstract: A sealed type hydraulic reservoir including a casing for storing brake fluid therein, a cap member detachably mounted on the casing and an elastic diaphragm member dividing the casing into upper and lower chambers. The lower chamber is defined by the diaphragm member and the liquid surface, and the pressure in the lower chamber is always maintained at the level of atmospheric pressure by two check valves, one for allowing the air flow from the upper to the lower chamber when the pressure in the lower chamber drops below the atmospheric level and the other for allowing the air flow from the lower to upper chamber when the pressure in the lower chamber rises above the atmospheric level.

Abstract: A reservoir of synthetic plastics material for a master cylinder is constructed from a base and a lid which are permanently connected together at their mating faces, for example by welding, along a join line which lies in a single plane. A partition is upstanding from the base and a passage defined by a wall and including a portion of the lid provides limited communication between chambers on opposite sides of the partition. At least one end of the passage lies outside at least one edge of the lid and the join line passes through the partition.

Abstract: A push rod assembly having a first section and a second section through which an input force is transmitted to an output member. The first section includes a cylindrical member with a bellows attached thereto. The cylindrical member has a bore therein. The second section includes a piston that is attached to a brake pedal by a pivot pin. The piston divides the bore in the cylindrical member into a first chamber and a second chamber. The piston has a passage therethrough that connects the first chamber with the second chamber. A valve located in the passage controls the communication of fluid from the first chamber to the second chamber. A linkage member which extends into the bore in the cylindrical member is connected to a plate with a slot therein. The pivot pin associated with the brake pedal extends through the slot to attach the plate to the brake pedal.

Abstract: A sealed type hydraulic reservoir including a check valve for normally preventing communication between a sealed chamber in which brake fluid is stored and the surrounding atmospheric environment. The check valve allows atmospheric air to flow into the sealed chamber only when the pressure in the chamber drops below atmospheric level. A second check valve may be included for allowing air flow only out of the sealed chamber when the pressure in the chamber rises above atmospheric level.

Abstract: A master cylinder has a housing with a bore therein having a tapered section located between first and second compensator ports connecting the bore to a reservoir. A sleeve locates first and second lip seals adjacent the first and second compensator ports, respectively. A first piston engages the first lip seal and a second piston engages the second lip seal to define first and second chambers within the bore. A bearing member which surrounds the first piston engages the sleeve and holds the first and second lip seals in a stationary position within the bore. Thereafter, an input member moves the first and second pistons past the first and second lip seals to pressurize the fluid in the first and second chambers and provides fluid pressure responsive devices with an operational input through first and second outlet ports in the housing.