Popping noise while braking

[XLCOR_65]

Well, I did some searching on the forum and didn't find anything close to this little issue I am having. So, I will ask you guys if you don't mind.

I noticed that when I am coming to a stop and must apply moderate pressure, there is a subtle, yet distinct, popping noise that I can feel in the pedal and hear when the window is down. I thought it could be a wheel weight because the popping gets slower as the truck comes to a stop, then it stops.

(kinda like this: poppoppoppop..pop..pop....pop......pop.........pop.............pop............pop............pop.... ..............pop..............................pop)

It is drum on all 4 corners, I put new pads on it last summer, turned the drums, new wheel cylinders, new bearings, etc.

Any ideas of where I should look? The front end is decent, doesn't need new ball joints or tie rods yet, even though I plan on doing that this summer just as preventative maintenance.

Thanks for your input!