line lock installation

I am installing this for my friend and have never done it before. Its not a "kit" so it doesnt have good directions for a ABS car. My main question is which line should i tap into to apply the line lock to the front brakes. I am thinking the line coming from the master cyllinder, going to the front port of the ABS unit...but i just want to make sure before cutting. Thanks for any help

Chad

Rear line out of the master cylinder/front line on the ABS module.