Trailer brake lining possibly glazed?

How's the brake adjustment?

Glad hand seal not folded up and restricting air flow down the service line?

 

Those drums either need ground down or replaced. Those are heat cracks from someone riding the brakes. If you get DOTed thy will right it up, don't think thy will put out of service but will note it on an inspection.

 

Stress cracks are normal

 

That much heat going into the trailer brakes could mean someone was using the trolly all the way down a steep grade.

The first photo shows it more clearly.

 

OP talks about brakes but posts pics of drums.

Adjust all your brakes. You can say they're within specs but I'm betting you've got gaps between the shoes and drums. Close those gaps

Nicely adjusted brakes make a world of difference.

And those drums aren't glazed. That's normal wear and tear. They get that way when it's time to replace.

 

Mmmmmmm TOASTY!!!

 

Shoes not touching drum evenly. Look at the edges, all clean and no dust on them. Center looks untouched and dusty. Trailer probably not greased often, cams get loose and sometimes even seized.

Cracks are "normal", only time it's considered "bad" is when it's from one end to the other. DOT won't say a thing... In my opinion they stretched drum lifetime a bit too much. May be the 3rd set of pads they are seeing. They are used evenly but they look very carved when looking at the outer lip of the drum. Seems like they have the right lining/drum combo for it's application, simply should have been changed last time lining was done.

What get DOT attention is when drums aren't evenly used, and you can see multiple lines of depth on drum. I have heard of resurfacing a drum but never done it, not worth it in my opinion. Drums are not that pricy. Drum should be expected to last 2 linings.

 

Drums don't last 2 linings.

My first lining gets close to the rivets and the brakes cam over.