2000 sierra brake issue

[wnaplay1647545503]

2000 sierra 2500. New hard brake lines throughout, 3 new calipers. I believe we have all the lines fed correctly into the abs unit under truck. having a hard time bleeding brakes. Got the back brakes to get fluid and may have bled correctly but couldn't get a drop out of the front. I read online that the abs may need cycled for proper bleeding and this requires a tech 2 scan tool. I also read that you could trick the abs into cycling by engaging it on wet grass or gravel but without getting any brake pressure that doesn't seem like an option. If I could get partial pedal I would consider this but I get nothing. Should I get fluid at the front calipers even with the abs not engaging? I tried several bleeding procedures and nothing worked on the fronts not a drop came thru even with vacuuming.