Bleeding brakes is best done with 2 people. one pumping the brakes, and one opening bleeders. you have to pump the brakes up, then hold pressure while you or your helper opens a bleeder to let air out, close it, then let off the brake pedal and repeat until ONLY brake fluid comes out of the bleeder. do this on each caliper. how mcuh fluid you need on hand depends greatly on how much air is in the lines.