that valve your looking at, does it have a wire coming out of it? if so it's not the place to start. anyway, you can do this allright I don't know what you mean by total contorl, more than just useing the parking brake? or do ya not have a parking brake now? is that why ya doing this? anyway, find the singal line that goes to the rear of the truck. it will have a rubber hose where it dropes down to the axle. if you find the hose you've fond the right line. just back up nere the fire wall and tie into it some place there. gots a flare tool? dubble flare? am I rammbling again? hope this helps some?
dang, I see your still @ one point! not any more