No tool box is complete without this great item. You can bleed your brakes by yourself. We recommend that brake fluid be changed on a yearly schedule. By bleeding brake the old fashioned way, master cylinder seals can be damaged. Mityvac s system is a safe tool that makes changing fluid easier and there is no risk of damaging the master cylinder. Attach the hose to the caliper s bleeder screw and squeeze the vacuum pump, loosen the bleeder screw and the old fluid will be sucked into the collector vessel. No need for an air compressor like many other bleeder tools. This great device comes with an all metal vacuum pump with gauge, collector, hose, all adapters, detailed instructions and a handy carrying case. Mityvac may also be used as a vacuum tester for all kinds of troubleshooting, such as distributor vacuum advances and pressure sensors. The uses are unlimited!