Abstract: A vacuum brake booster having a vacuum chamber and a working chamber, which are separated from one another by a movable wall, and a control valve is described. The control valve has a control valve housing (10), which is coupled workingly to the movable wall and which, for achieving a pressure difference at the movable wall, is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber in dependence upon the displacement of an input element of the vacuum brake booster. The control valve housing (10) comprises an outer sleeve (12) and an inner sleeve (48), which is disposed radially at the inside of and coaxially with the outer sleeve (12) and is connected by a plurality of webs (58, 62) to the outer sleeve (12).

Abstract: A vacuum brake booster having a vacuum chamber and a working chamber, which are separated from one another by a movable wall, and a control valve is described. The control valve has a control valve housing (10), which is coupled workingly to the movable wall and which, for achieving a pressure difference at the movable wall, is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber in dependence upon the displacement of an input element of the vacuum brake booster. The control valve housing (10) comprises an outer sleeve (12) and an inner sleeve (48), which is disposed radially at the inside of and coaxially with the outer sleeve (12) and is connected by a plurality of webs (58, 62) to the outer sleeve (12).

Abstract: A vacuum brake booster (10) has a control valve housing (30) for a control valve (28) actuated by a bar shaped input member (34). A guide sleeve (42) is secured to the control valve housing and has a slot (68) aligned with a vent duct (62) in the control valve housing. A sensing plunger (36) is axially slidable in the guide sleeve by the input member, and a transversely extending stop bar (66) is fixed to the sensing plunger. The stop bar extends through the slot of the guide sleeve and into the vent duct. To improve flow through the vent duct, edges of the slot form axial stops for the stop bar, so that the axial extension of the slot defines the maximum stroke of the sensing plunger. Where the stop bar extends into the vent duct, the vent duct is obliquely oriented towards a working chamber (26), and has an axial extension considerably larger than that of the slot.