Do you guys consider this as tread/sidewall separation

I wouldn't trust those boxy Fed Ex trucks. One tire blow out could really hurt somebody.

 

Now, had they left the drum on there, those brakes would still be there, doing what they're supposed to do. But, NO! Johnny Do-Gooder just HAD to make a fuss, and now the company gotta spend money.

Truly, I kid. Although the brakes don't look too horrible in the pic, (I wouldnt wanna take it real far) we only see a small section. And even though there's 9 other brakes on the truck and trailer, who's to say they're not as bad, or worse?

 

Actually what that looked like to me is what used to be called a cold cap. Those things do that all the time.