[Batman]

You have to take the master back off and bench bleed it, I had the same problem on mine. If you don't bench bleed it you will just keep sucking fluid right through it. Fill the master cylinder up with fluid, re-install it, then bleed the system from the slave cylinder. Make sure you don't empty the reservoir under the hood, or you will have to start all over. I HIGHLY recommend manually bleeding it so you don't drain the reservoir too quickly.