Count me in on this issue.
At first I just had a minor cricket noise which I noticed only while applying the brakes next to a concrete wall or building (think "drive through"). Had dealer attempt to fix it several times, each time it goes away for about 2000 to 3000 kms and then comes back. Finally I told them just to put new pads in which I paid for out of pocket as my truck (of course) is now out of warranty still trying to get this resolved. Hasn't been long enough to know if that fixed it there.
2 weeks ago I started noticing a cricket squeak going over bumps only. I didn't notice anything while applying the brakes next to a wall (the original issue I had), just a much louder squeak over large enough bumps. I noticed that if I was on a particularly bumpy road and was slowing down agressively (braking while pulling my trailer) then it would never squeak over bumps while applying the brakes.
That led me to this thread, and I tried the wd40 yesterday. No more squeak.
Which begs the question: after 30 years of ABS, how does FCA still not know how to build a truck that doesn't squeak, squeal or moan while I'm backing up?
I really want to like my truck, but I'm quickly reaching the end of the line.