The invention relates to a compensation tank 1 for hydraulic motor vehicle brake systems, comprising a tank housing 9, the tank housing having at least one hydraulic fluid chamber 2 which can be filled with hydraulic fluid via a filler neck 3 and having a cap 4 which can be fastened to the filler neck 3 by means of a threaded connection with a cap and a tank thread 5, 6. It is proposed according to the invention that the cap 4 and the tank housing 9 each have one stop 10, 11, which stops permit predetermined positioning of the cap 4 in relation to the tank housing 9.