Trailer brake lining possibly glazed?

It depends on who’s going to pull you over.

“Cracked brake lining – cracks or voids that exceed 1/16 inch in width observable on the edge of the lining. ( Portion of a lining segment is missing such that a fastening device (rivet or bolt) is exposed when viewing the lining from the edge.”- Out of service criteria.

I’d get the brakes replaced. Brakes are those things that I don’t take chances with.

It’s 2019 and its very sad to see drivers going down the mountain, fully loaded at high speed and in the wrong gear. This “gotta catch up” mentality needs to stop.

 

The cracks are in the drum - not the lining. Big difference.

The small cracks are common with linings, but are they with the drum itself?
There had to be some very serious heat and pressure to do that.

 

The cracks in the drum are pretty normal, your pics don't show enough of the lining to tell how much life they have left but brakes that are adjusted feel the same on their last day as they do on their first day; they heat up faster when they are thin but when you first apply them they feel fine.

Check your brake adjustment and open the trailer air tanks to see if they are full of water, I bet one of those (or both) are the reason for your weak brake performance.

 

That's why I mentioned "with the right lining/pad combo" sometimes I see lining eating chunks of drum. Meaning linign is too aggressive for that drum. Key to success is right combo, keep it greased, and whenever you are doing linings, make sure to change rolls too, even if they look okay. Also watch for play on cams and slack. Everything is linked together. Even the booster rod can screw brake performance. Sometimes see rods pushed against the booster, causing brakes to release slower...