I just had to replace the brake line assmbly underneath the hood of my outback.(what a pain) There's plenty of air throughout the system now and I'm not sure how t start getting the new brake fluid through the system. I've read the order that I'm supposed to bleed them in but haven't seen anything about the master cylinder. I opened the front passenger bleeder and filled the reservoir but it's not going into the system. Do I need to do something with the master cylinder first? Thanks for any input.