And I am getting nothing but air and the vacuum is not holding pressure. What do I do. The break pedal was going to the floor. So I have replaced the front calibers and the master cylinder. I also bought a vacuum pump for bleeding the lines.
The pump held pressure at first and I got some old looking fluid out but not much at all. Now the pump will not hold pressure and I am getting nothing but air. I see no signs of leaks anywhere in the lines.
The air is coming in between the threads of the bleeder screws. Very few people use vacuum bleeders. I have the best luck simply letting the brakes gravity-bleed. Leave a small gap open on the reservoir cap so it doesn't build vacuum that prevents the fluid from flowing. When fluid drips from one bleeder, snug it and wait for the next one to flow. When they're all bled, irritate the brake pedal a few times by hand, open each bleeder once more for a few seconds, tighten them and you're done.
The calipers won't cause the brake pedal to sink to the floor. When it comes to replacing the master cylinder, there is a simple trick that eliminates the need to bleed at the wheels. The disadvantage to that is you don't remove the old moisture-laden brake fluid.