Few questions first. Are you doing the work or is a shop doing it? When you change pads are you also changing calipers? How many miles on truck, calipers and since last pad change. What part of the country are you in.
You didn't say what you replaced. A common cause is the caliper slide pins sticking. If you just replace pads, and leave the slide pins as in, you'll just have the same problem. Improper grease (petroleum based) on the slide pins can cause issues.