Abstract: A pressure fluid reservoir is made from two housing components, that are brought together with an outer and inner thread arrangement with end stops formed by adjacent ends of the two housing components. The first housing component of the pressure fluid reservoir includes two segments and the second housing component includes two guide faces with an inner thread and an outer thread located between them. The guide faces are disposed with such a length and such a spacing with respect to one another that prior to the threads being screwed together during assembly, the threads are sealed off from the reservoir chambers and two stop faces facing one another on the housing components come into contact on their ends once the screwing operation is completed. The ends are exposed to the outside so that the contact between the ends can be seen from the outside.

Abstract: In a tandem master cylinder for a vehicle hydraulic brake system having a push-rod piston designed as stepped piston and an intermediate piston designed as stepped piston both pistons being aligned in a stepped bore of the cylinder housing for the purpose of obtaining a particularly short and compact design. The working cylinder communicates with the connecting bore of the one brake circuit provided in the large-diameter step of the intermediate piston, while the small-diameter step of the intermediate piston fits in the working cylinder formed by the small-diameter step of the stepped bore so that the working cylinder is in communication with the other brake circuit via the connecting bore.

Abstract: A tandem master cylinder which has a compensating bore in communication with a chamber on the rear side of the master piston. The bore is provided in the front wall of master cylinder piston and is adapted to be closed by means of valve body movable relative to said master cylinder piston. The valve body is provided on the end of a central clamping element interconnecting the two spring retainers of a piston restoring spring of master cylinder piston. The valve body is urged against compensating bore as soon as the piston restoring spring is loaded. In order to maintain a predetermined filling pressure in the chamber behind the master cylinder piston and in the output position of the piston in pressure chamber, the piston restoring spring is supported on a spring retainer that is held through a stop on the cylinder housing.