If you ran the master cylinder dry, there is likely air in the ABS hydraulic controller. You may need a scanner to activate the valves to get the air out. In the future, to prevent the master cylinder from running empty, place a stick from the seat to the brake pedal to hold the pedal down about 2". The lip seals will hold the fluid from running down until you're ready to bleed.
Also, when you use a helper to bleed the brakes, tell them to never push the pedal more than half way to the floor. Doing so will run the lip seals over the crud and corrosion that builds up where the seals don't normally travel. If the seals get ripped, you'll have a pedal that might pump up at times, but if you hold steady pressure on the pedal, or modulate that pressure slightly, the pedal will suddenly sink to the floor. It doesn't sound like that's what happened to you, but keep that in mind for the future.
Tuesday, April 19th, 2011 AT 1:42 AM