A bleed valve includes an elongate bleed valve bore having a first bore end in fluid communication with an ambient space and a second bore end, longitudinally spaced from the first bore end, with a bore lumen extending between the first and second bore ends. An elongate bleed valve shuttle extends partially through the bore lumen for selective reciprocal motion between the first and second bore ends. The bleed valve shuttle has longitudinally spaced first and second shuttle ends selectively located longitudinally adjacent the respective first and second bore ends. The bleed valve shuttle shifts longitudinally toward the first bore end into an operational configuration responsive to presence of a predetermined hydraulic pressure level within the bore lumen along a bleed valve fluid path. Shifting of the bleed valve shuttle into the operational configuration is operative to urge air from the bore lumen into the ambient space.

A bleed valve includes an elongate bleed valve bore having a first bore end in fluid communication with an ambient space and a second bore end, longitudinally spaced from the first bore end, with a bore lumen extending between the first and second bore ends. An elongate bleed valve shuttle extends partially through the bore lumen for selective reciprocal motion between the first and second bore ends. The bleed valve shuttle has longitudinally spaced first and second shuttle ends selectively located longitudinally adjacent the respective first and second bore ends. The bleed valve shuttle shifts longitudinally toward the first bore end into an operational configuration responsive to presence of a predetermined hydraulic pressure level within the bore lumen along a bleed valve fluid path. Shifting of the bleed valve shuttle into the operational configuration is operative to urge air from the bore lumen into the ambient space.

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 bicycle brake caliper apparatus comprises a caliper housing and a plug. The caliper housing includes a fluid chamber and an opening for receiving the plug therein, wherein the opening extends to an outside of the housing at a first location. The housing also includes a fluid passage in fluid communication with the fluid chamber, wherein the fluid passage is in fluid communication with an outside of the housing at a second location offset from the first location. The fluid passage is closed when the plug is in a first position. The fluid passage is open when the plug is in a second position so that fluid is allowed to flow from the fluid chamber, through the fluid passage and to the outside of the housing at the second location.

A bicycle brake caliper apparatus comprises a caliper housing and a plug. The caliper housing includes a fluid chamber and an opening for receiving the plug therein, wherein the opening extends to an outside of the housing at a first location. The housing also includes a fluid passage in fluid communication with the fluid chamber, wherein the fluid passage is in fluid communication with an outside of the housing at a second location offset from the first location. The fluid passage is closed when the plug is in a first position. The fluid passage is open when the plug is in a second position so that fluid is allowed to flow from the fluid chamber, through the fluid passage and to the outside of the housing at the second location.

A hydraulic fitting (10) for a hydraulic transmitter system (100) having a housing (12) in which a fluid reservoir (16), a pressure chamber (20) which is fluidically connected to the fluid reservoir (16) and a venting bore (22, 22) which connects the pressure chamber (20) to a housing surroundings are configured, wherein the venting bore (22, 22) can be closed in a closed position (III) during operation and can be opened to produce a venting position (V), also having an additional fluid connection between the fluid reservoir (16) and the pressure chamber (20) which is interrupted during operation but which can be temporarily opened to permit rapid venting in a rapid venting position (IV) while the venting bore (22) remains closed.

A hydraulic fitting (10) for a hydraulic transmitter system (100) having a housing (12) in which a fluid reservoir (16), a pressure chamber (20) which is fluidically connected to the fluid reservoir (16) and a venting bore (22, 22) which connects the pressure chamber (20) to a housing surroundings are configured, wherein the venting bore (22, 22) can be closed in a closed position (III) during operation and can be opened to produce a venting position (V), also having an additional fluid connection between the fluid reservoir (16) and the pressure chamber (20) which is interrupted during operation but which can be temporarily opened to permit rapid venting in a rapid venting position (IV) while the venting bore (22) remains closed.

An oil supply unit includes a reservoir connected to an outlet tube. A base has a recessed area defined in the top thereof, and a tubular portion extends from the bottom of the base. The recessed area has a passage which communicates with the tubular portion. The outlet tube extends through the passage and the tubular portion. A securing unit extends through the base and located corresponding to the tubular portion. The securing unit is movable relative to the outlet tube. A board is connected to the base and has a pass hole through which the outlet tube extends. Two springs are biased between one end of the board and one of inside walls of the recessed area. An object is clamped between the base and the securing unit such that the oil supply unit is stably and securely supply oil to a vehicle.

A hydraulic braking system includes: a master cylinder including a pressurizing piston, a rearward chamber, and a pressure chamber; and a rearward-hydraulic-pressure controller connected to the rearward chamber and including a pressure increase valve and a regulator for controlling a hydraulic pressure in an output chamber. An air detector includes: an upstream detector, including the rearward-hydraulic-pressure controller, for detecting presence or absence of air in an upstream portion based on a relationship between the hydraulic pressure in the output chamber and an open time of the pressure increase valve; and a downstream detector for detecting presence or absence of air in a downstream portion based on a relationship between a stroke of the pressurizing piston and the hydraulic pressure in the output chamber. The downstream portion includes a portion located downstream of the pressure chamber of the master cylinder.

A hydraulic braking system includes: a master cylinder including a pressurizing piston, a rearward chamber, and a pressure chamber; and a rearward-hydraulic-pressure controller connected to the rearward chamber and including a pressure increase valve and a regulator for controlling a hydraulic pressure in an output chamber. An air detector includes: an upstream detector, including the rearward-hydraulic-pressure controller, for detecting presence or absence of air in an upstream portion based on a relationship between the hydraulic pressure in the output chamber and an open time of the pressure increase valve; and a downstream detector for detecting presence or absence of air in a downstream portion based on a relationship between a stroke of the pressurizing piston and the hydraulic pressure in the output chamber. The downstream portion includes a portion located downstream of the pressure chamber of the master cylinder.