Rebleed Master Cylinder?

make sure your rears are adjusted. If they are not they can take alot of fluid. Fronts are the large reservoirs and displace more than the drums. Your disks should be audibly dragging if they are filled as they dont back off the disk with any spring, just the action of the piston lip seal. Yes, route some bent brake lines back under the fluid levels of the reservoirs and press slowly until your assistant sees no bubbles. You can gravity bleed them too but it takes a watchful eye on the reservoirs to make SURE they dont go dry.