Aspirator for brake fluid. Pneumatic unit for draining and renewing the fluid from the hydraulic brake circuit of vehicles, including circuits with braking corrector device. The unit is equipped with a module with a self-supporting tank (5 l) and a lower pre-chamber for accumulating high pressure air (8 bar). The self-supporting tank is divided into two chambers by an internal elastic diaphragm, the upper chamber for new brake fluid and the lower chamber for air under stabilized pressure (1.5 bar). It allows the drainage and the renewal of the liquid of the circuit by a single person in a fast and clean way. It includes: Set of five coupling plugs to the brake fluid circuit reservoir. Universal adapter cap. Drain tank set with bleed valve adapters. Instruction book: 839800.