This is my low tech, when working alone technique; start with a full master cylinder then go to the furthest brake (right rear), loosen the bleeder and slip a piece of rubber or plastic tubing over the bleeder, place the open end of the tubing in a bottle or jar that has a small amount of brake fluid in the bottom (make sure the open end of the tube is covered). Then pump away on the brake peddle with occasional checks to make sure the master cylinder doesn't run dry. When clean fluid comes out (you can tell with frequent checks of the clear container) move to the next furthest away wheel and repeat.
The advantages to this method are; 1. usually zero cost over the brake fluid, 2. can do by yourself, 3. the old fluid is forced out under pressure which will flush out the old accumulated crud, gravity flushing won't.
And no, you don't introduce air into the system this way.
Good Luck, Ron
