Abstract: A master cylinder of the quick-fill type has a pressure cylinder, a reservoir mounted thereon and a quick-fill chamber. The reservoir forms a compartment housing valve means controlling communication between the quick-fill chamber and reservoir.

Abstract: A master cylinder of the quick-fill type has an open-ended pressure cylinder closed by a closure member and a reservoir mounted on the cylinder. The closure member partially defines a quick-fill chamber in which slides a piston connected to a piston of the pressure cylinder. A valve controls communication between the quick-fill chamber and the reservoir.

Abstract: In a servo booster for a vehicle braking system, of the kind having a tie rod for relieving the booster housing of braking reaction forces which extends through the movable wall(s) of the booster, the movable wall is sealingly connected to a wall of the housing by a bellows located substantially coaxially about the tie rod. The bellows has at least one integral reinforcing rib which completely encircles the tie rod. The rib resists ballooning of the bellows and also guides the bellows along the tie rod. In the case of a tandem booster having a stationary partition wall between a pair of movable walls, the interior of a bellows connecting the rear movable wall to the partition wall provides fluid communication between the chambers bounded by the rears of the movable walls. Fluid communication between the other two chambers is provided via a tubular member integral with the front movable wall and extending sealingly through the partition wall.