I changed a brake hose and caliper on my Expedition and accidentally emptied master cylinder during repair. I plan to flush the old fluid from all 4 of my brake lines, so my question is whether I need to remove the lines from the master cylinder first to bleed the master cylinder, or if it will bleed itself while I am pushing the old fluid from the lines. I plan to gravity bleed the front brake line and caliper that I replaced first (After re-filling the master cylinder).