When brakes are replaced why won't my truck stop?

When this happens I always clear the ABS computer memory, this takes a scanner. Also, when ever I do work on a new car or truck brake system, you MUST have the key OUT of the ignition and all doors closed, because the ABS system is still partially energized. About once a week in the shop where I work I have to help guys with this type of problem and invariably, they had the key in the ignition. In almost all newer repair manual info for brake work on 2000 and newer cars and truck, it says, emphatically to DISCONNECT the battery negative terminal before doing ANY brake work to prevent this head ache. So do this first ,then suspect other things like a bad master cylinder etc..keep plenty of brake fluid in the reservoir,don't let it run dry/out!!!