I am using speed bleeders on my Alfa, with fresh thread sealant applied. The system drained while I was applying the new thread sealant. I started bleeding the system with all of the bleeders open. The front brakes bleed quickly. When I closed the front brake bleeders, the pedal stopped traveling all the way to the floor. I've pumped several large bottles of brake fluid through the rear brakes, and I still get a lot of bubbles. Before I bled the system, the brakes were a little week after the car wasn't driven for two or three months due to a break down.