98 Chevy Silverado K1500 – How to bleed a brand new brake system

Bleeding sequence is RR,LR,RF,LF
Right equals passenger’s side.
One method to use if you lack an assistant is to gravity bleed the brakes.
All it involves is filling up the master cylinder reservoir, cracking open all the bleeder screws and making sure you keep the fluid from running out completely.
Once the calipers start dripping fluid, close those bleeders and continue to let the rear brakes bleed until they’re dripping.

You may not have air trapped in the ABS unit.
Unless you own a Tech2 or SnapOn or other high end scan tool, you will have to force the ABS to activate in order to bleed it.
Drive to an empty gravel road and slam on the brakes a few times.
That will force the air out of the ABS unit.

Then bleed the brakes again.