Chevrolet Repair: Brake Issue, chevy blazer, abs pump

Question
I have a 1993 Chevy Blazer Full size. I have had to replace the brake lines coming from the abs pump to the rear and also the front lines to front wheel. My problem is that with car off i bleed the brakes and got firm pedal, but when truck starts up i have nothing for brake pedal. How do i bleed the abs. I opened the bleeders and nothing came out on the abs pump.

Answer
best way is with an apropriate scan tool , if you have some brakeing when it is running
i have seen some guys without access to the scanner take the vehicle to a dirt lot and
repeatedy hit the brakes hard to activate the abs , you will feel the brake pedal vibrate
when that happens and will eventually get the air out. the best way is to have a mechanic
do it whith a scan tool