On cars with a right-hand steering the tank for brake liquid is from the opposite side of podkapotny space.
Control of level of liquid
Liquid level always should be between "max" and "min" marks. Insignificant decrease in level of liquid in process of run of the car speaks wear and automatic adjustment of brake slips. This normal phenomenon.
At considerable decrease in level of liquid for a short period or its falling below a label of "min" depressurization of brake system is not excluded. About too low level of brake liquid in a tank inclusion of a control lamp of brake system signals. The urgent address on the Audi enterprise for system check is obligatory.
Replacement of brake liquid
Brake liquid is hygroscopic. Therefore eventually it absorbs moisture from air and accumulates in itself water. The raised content of water considerably lowers a boiling point and under certain conditions can worsen brake effect. Therefore replace brake liquid each two years!