[Norway 911T]

This has me completely baffled. I am restoring a 1972 911T. I have installed a complete new system. Everything part from the fluid container down to new calipers is new.
I am using the good old fashioned method for bleeding using tube to container and pumping the peddle. I have cleared to back brakes OK but the front seem to be getting more air in as I bleed them. I'm not talking tiny bubbles but huge slugs of air coming through the tube. I have pumped litres of fluid through to no avail. Their are no leaks anywhere so how can this air get in? Could it be from the front brake feed line? I even went out and bought another new master cylinder thinking there was a fault there. Anyone else experienced this problem? It has me so frustrated.

Derek.

Norway.