Features and benefits brake bleeder, fluid evacuation, master cyclinder auto filler, automatic brake fluid dispenser the master cylinder auto filler automatically refills the brake fluid reservoir during brake bleeding. base plate retaining clip and height adjustment allows fit on all reservoir types the vacuum brake bleeder/fluid evacuation has a universal rubber fitting holds securely on brake bleeder screw attach shop air and use the ball valve for on-demand vacuum and hands free operation. 6 l capacity on/off tap allows installation and storage without drips or spills. 20 oz. (600ml) capacity this one man brake bleeding system allows for fast and efficient vacuum brake bleeding.