bleeding rear brake

replaced master cylinder kit, bleed the rear brake, no pressure,replaced rear caliper kit, bleed the rear brake, no pressure, any thoughts on this, been bleeding for days on end now, getting a bit fed up pushing the lever up and down

It is a real pain to manually bleed our rear brakes, but it can be done
Easiest is to use a vacuum bleeder though

When starting with an empty system I find it easiest to take a small medicine syringe (about $2 from drug store) and push fluid up from the caliper end until the reservoir is full. Then bleed like normal.

Same problem.
I had bark wire around my rear wheel and from that moment my rear brake doesn't work (no pressure at all). I thought it was the rear brake line (replaced it for a new one, can't find a leak in the old line) but still no pressure.
I pushed the brake fluid with a stiringe in the system (several times). Tried to bleed the normal way as well but no pressure at all.
Has anyone an idea what it could be?

I like to dismount the caliper and raise it up higher than the master cylinder.