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 bleeding device (1, 100) for bleeding air from a hydraulic system, which includes a bleed screw (2, 102) and a bleeding needle (3, 103) for unseating the bleed screw (2, 102) to enable any air trapped within the system to be bled. The bleed screw (2, 102) is receivable within a threaded bleed port (41) in a component of the system, such as a brake caliper (4). The bleed screw (2, 102) includes a socket (28, 128), a conical sealing face (27) and a radial fluid passage (24) between the sealing face (27) and the socket (28, 128). The bleed needle (3, 103) includes a plug (34, 134) for releasable engaging receipt within the socket (28, 128) of the valve member and a fluid passageway (31) which is in fluid communication with the radial fluid passage (24) of the bleed screw (2) when the plug (34, 134) is received within the socket (28, 128). The bleed screw (2, 102) is movable, in use, between a sealed position in which the sealing face (27) seats against the sealing face (43) of a bleed port (41) and a bleeding position in which the sealing face (27) is unseated to open fluid communication between the bleed port (41) and the fluid passageways (24, 31).

A bleeding device (1, 100) for bleeding air from a hydraulic system, which includes a bleed screw (2, 102) and a bleeding needle (3, 103) for unseating the bleed screw (2, 102) to enable any air trapped within the system to be bled. The bleed screw (2, 102) is receivable within a threaded bleed port (41) in a component of the system, such as a brake caliper (4). The bleed screw (2, 102) includes a socket (28, 128), a conical sealing face (27) and a radial fluid passage (24) between the sealing face (27) and the socket (28, 128). The bleed needle (3, 103) includes a plug (34, 134) for releasable engaging receipt within the socket (28, 128) of the valve member and a fluid passageway (31) which is in fluid communication with the radial fluid passage (24) of the bleed screw (2) when the plug (34, 134) is received within the socket (28, 128). The bleed screw (2, 102) is movable, in use, between a sealed position in which the sealing face (27) seats against the sealing face (43) of a bleed port (41) and a bleeding position in which the sealing face (27) is unseated to open fluid communication between the bleed port (41) and the fluid passageways (24, 31).

The disclosure relates to a brake release system including a parking brake having a brake chamber. The system includes a regular air supply passage, and an auxiliary air supply passage configured to supply pressurized air to the brake chamber for releasing the parking brake. A valve device is provided in the auxiliary air supply passage, the valve device including an exhaust port. A pressure-responsive element is configured to actuate the valve device and configured to be in fluid communication with the regular air supply passage, such that when pressurized air is supplied through the regular air supply passage then the air activates the pressure-responsive element so as to actuate the valve device to move to a closed first state, and when no pressurized air is supplied through the regular air supply passage then the pressure-responsive element is deactivated to allow the valve device to move to an open second state.

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.

A dual input master cylinder, comprising a housing having a first input, a piston base positioned within the housing, and a piston rod having a first end and a second end, the first end of the piston rod abutting the piston base and the second end of the piston rod acting as a second input of the dual input master cylinder, wherein the piston rod is capable of being spaced apart from the piston base.

A dual input master cylinder, comprising a housing having a first input, a piston base positioned within the housing, and a piston rod having a first end and a second end, the first end of the piston rod abutting the piston base and the second end of the piston rod acting as a second input of the dual input master cylinder, wherein the piston rod is capable of being spaced apart from the piston base.

A venting valve includes a bore lumen. An MC valve passage is in fluid communication with the bore lumen. A venting fluid passage is in fluid communication with the bore lumen at a location spaced from the MC valve passage. An SCA valve passage is in fluid communication with the bore lumen at a location between the MC valve passage and the venting fluid passage. A venting valve shuttle moves between first and second shuttle positions at least partially responsive to fluid pressure. Shifting of the venting valve shuttle toward the second shuttle position urges air from the bore lumen into the ambient space via the venting fluid passage.

A venting valve includes a bore lumen. An MC valve passage is in fluid communication with the bore lumen. A venting fluid passage is in fluid communication with the bore lumen at a location spaced from the MC valve passage. An SCA valve passage is in fluid communication with the bore lumen at a location between the MC valve passage and the venting fluid passage. A venting valve shuttle moves between first and second shuttle positions at least partially responsive to fluid pressure. Shifting of the venting valve shuttle toward the second shuttle position urges air from the bore lumen into the ambient space via the venting fluid passage.