Abstract: A power booster comprises a rear housing section and a piston. An inner bearing is disposed around the piston, and is adjustable relative to the rear housing section to translate the piston. A method of setting an axial dimension of the power booster is also provided.

Abstract: The problem of providing air from a vehicle engine compartment to a breather port of a vacuum booster mounted on a wall separating the engine compartment from the passenger compartment is solved by adapting the wall to provide an air passage, when the rear wall of the booster is bearing against the wall.

Abstract: A power booster comprises a housing, a tube, and a seal. The housing includes a front housing section, a rear housing section, and a divider. The tube is mechanically fastened proximate the rear housing section and generally stationary relative to the rear housing section, with the seal between the divider and the tube.

Abstract: A power booster comprises a rear housing section and a piston. An inner bearing is disposed around the piston, and is adjustable relative to the rear housing section to translate the piston. A method of setting an axial dimension of the power booster is also provided.

Abstract: The problem of providing air from a vehicle engine compartment to a breather port of a vacuum booster mounted on a wall separating the engine compartment from the passenger compartment is solved by adapting the wall to provide an air passage, when the rear wall of the booster is bearing against the wall.

Abstract: A power booster comprises a housing, a tube, and a seal. The housing includes a front housing section, a rear housing section, and a divider. The tube is mechanically fastened proximate the rear housing section and generally stationary relative to the rear housing section, with the seal between the divider and the tube.

Abstract: An airvalve assembly for a brake booster includes first and second members movable relative to each other to allow the passage of fluid, and a clip. The clip engages one of the first or second members, and has a spring arm which engages the other of the first or second members to normally position the first and second members relative to each other.

Abstract: An airvalve assembly for a brake booster includes first and second members movable relative to each other to allow the passage of fluid, and a clip. The clip engages one of the first or second members, and has a spring arm which engages the other of the first or second members to normally position the first and second members relative to each other.

Abstract: A master cylinder is disclosed which is switched from a normal operating mode to a secondary mode when available vacuum is insufficient to operate the booster or at booster run-out. In these circumstances where the normal power assist from the booster is not available, the effective area of the input plunger of the master cylinder is reduced to reduce the manual actuating force required to generate braking pressure, thereby enabling the vehicle operator to more easily generate braking pressure.

Abstract: This brake booster comprises an enclosure (40), a diaphragm (42) dividing the enclosure into a front chamber (46) connected to a source of vacuum and a rear chamber (48), a piston (44) that can move axially in the enclosure and on which the diaphragm is mounted, a plunger (50) mounted so that it can move axially in the piston between a forward unstable braking position and a retreated stable position of rest, and a valve (54) intended to collaborate with seats (56, 58) on the piston and on the plunger. The or each seat (56) on the piston (44) is formed on the edge of a passage (60, 62) allowing the said chambers (46, 48) to communicate.