Abstract: The structure comprises a molded plastics housing either having a metallic sleeve molded therein which forms a cylinder for a piston or defining the cylinder itself. An annular retainer for the piston is provided which abuts a location surface of the sleeve or an anchoring element molded in the housing. The location surface is provided by deforming the sleeve or anchoring element so that the location surface engages the annular retainer at a position radially inboard of its outer periphery.

Abstract: An inertia valve includes a valve member which is free to move axially in a cylindrical housing between a baffle plate and a valve seat. The baffle plate is provided with at least one collapsible formation which may be partially crushed against an adjacent wall of the housing to provide approximate location of the baffle plate relative to the valve seat and an adjustable screw demise for accurately adjusting free movement of the valve member after assembly of the valve.

Abstract: A hydraulic master cylinder has a piston of cylindrical section slidably sealed within the cylinder bore. An insert is mounted on the piston and defines an axial groove for engagement of an abutment projecting laterally into the cylinder bore, and a transverse slot for retention of a lever which is adapted to engage the abutment to control the opening and closing of a breather valve.

Abstract: An inertia valve includes a valve member which is free to move axially in a cylindrical bore and a valve seat which may be closed by the valve member is provided at one end of the cylindrical bore, said valve seat being supported on a support member so that it surrounds a port defined by the support member, the seat being spaced from the support member at its inner periphery so that it provides a flexible inner peripheral portion which may be deformed by the valve member.

Abstract: The clutch release mechanism includes a fluid actuator having an actuator member movable by fluid pressure in a clutch release direction to release the clutch, a release bearing assembly for connection to part of the clutch, and a coupling for connecting the release bearing assembly to the actuator member. The coupling is fluid operable whereby in one condition it prevents axial separation of the actuator member and release bearing assembly by engagement of pins and a groove and, in another condition, it allows axial separation and coupling of the release bearing assembly and the actuator member by disengagement of the pins and groove.

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 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: The clutch release mechanism includes a fluid actuator having an actuator member movable by fluid pressure in a clutch release direction to release the clutch, a release bearing assembly for connection to part of the clutch, and a coupling for connecting the release bearing assembly to the actuator member. The coupling is fluid operable whereby in one condition it prevents axial separation of the actuator member and release bearing assembly by engagement of pins and a groove and, in another condition, it allows axial separation and coupling of the release bearing assembly and the actuator member by disengagement of the pins and groove.