Abstract: Pneumatic brake booster (10) for a motor vehicle, comprising a moving internal partition (14) provided with a cup (38) covered by a sealing diaphragm (42) connected to the inner periphery of the casing (12), of the type in which the booster (10) is intended to be fastened to a bulkhead (34) of an associated vehicle by means of tie rods (24) of axial orientation passing through the casing (12) of the booster (10) and through the moving partition (14), and of the type in which the cup (38) has an aperture (46) associated with each tie rod (24) that accommodates a sealing ring (48) which is, on the one hand, fastened to the cup (38) and which is, on the other hand, slideably mounted on the associated tie rod (24), characterized in that the cup (38) comprises a tubular element (50) which contains the aperture and which extends at least axially in part around the sealing ring (48).

Abstract: Pneumatic brake booster (10) for a motor vehicle, comprising a moving internal partition (14) provided with a cup (38) covered by a sealing diaphragm (42) connected to the inner periphery of the casing (12), of the type in which the booster (10) is intended to be fastened to a bulkhead (34) of an associated vehicle by means of tie rods (24) of axial orientation passing through the casing (12) of the booster (10) and through the moving partition (14), and of the type in which the cup (38) has an aperture (46) associated with each tie rod (24) that accommodates a sealing ring (48) which is, on the one hand, fastened to the cup (38) and which is, on the other hand, slideably mounted on the associated tie rod (24), characterized in that the cup (38) comprises a tubular element (50) which contains the aperture and which extends at least axially in part around the sealing ring (48).