A supply tank for supplying fluid to a tandem master brake cylinder of a motor vehicle. The tank has a bottom section and a top section which is not shown. The bottom section comprises a partition wall which separates the two chambers from each other, the partition wall being formed with a passage which is arranged approximately in the center of the bottom section. In each chamber, an outlet is configured at each end of the bottom section. From each outlet and along the partition wall toward the middle of the bottom section, there extends one pipe which has an opening respective at its free end. The openings are positioned below the minimum admissible fluid level. The purpose achieved by the configuration of the pipes within the supply tank is that the effect of an inclination of the supply tank does not impair the efficiency of the hydraulic fluid and that, consequently, the outlets are supplied with hydraulic fluid at all times and in any condition.

A hydraulic fluid reservoir for automobile including a plurality of fluid chambers separated by a partition, the fluid chambers being communicated with hydraulic systems in the automobile respectively, and a baffle plate between the upper end of the partition and an inlet at the upper portion of a reservoir body to define openings of the respective fluid chambers at predetermined ratios which define the flow rates of fluid into respective fluid chambers.

In order to prevent hydraulic fluid infiltrating out from a hydraulic fluid tank (1) when a vehicle is in operation, the invention provides for the tank to be compartmentalized by an anti-overflow partition (16). The anti-overflow partition is made in such a manner as to hold air captive inside the tank in the vicinity of a feed orifice (11) at a location placed in a top portion of said anti-overflow partition.