A sometimes missed step in a brake job is to ensure the pads slide easily along the slides and caliper grease needs to be applied along both the slides and anywhere the metal parts of the pad backing plate touches the metal surfaces of the caliper and pistons.
When I installed my new front brakes a few weeks ago, the slot in the new brake pads were a little too tight and would not allow the pads to freely slide back and forth along the new slides.
When you applied the brakes, the pads clamped down on the rotor just fine, but when the caliper retracted, the pads stayed hung on the rotors.
This was something I learned to check for a long time ago.
So, I spent some time with my grinding stone on my Dremel tool and I opened up the slots on the brake pads where they were not sloppy loose, but would slide nicely along the greased caliper slides.
The other grease on the metal touching parts helps to prevent any squealing and squeaking when the brakes are applied.
When test driving after a fresh brake job, I take my laser temperature tool and after I bed the brakes and drive around for a while, I check the rotor and caliper metal surfaces for even and not too high temps on both sides of the truck.
I will even carry my temperature tool around and randomly check the temps after a drive for a few days
The temps of a binding brake will obviously be way higher than a good functioning set of brakes.
A good set of brakes actually does not get really hot during normal operation.