Problem with electric brake trailer

I'm not very up to speed on electric brake trailers as I only have one. Here's my issue, 3 years ago I purchased a Kaufman 10 ton electric brake equipment trailer so I could pull it with the heavy and light duty trucks. This last week I noticed the trailer wasn't breaking well and did some investigating. I found out only one axle was breaking good. The brakes are supposed to be self adjusting and found them to be out of adjustment so I adjusted them. Still not working except one axle. I then tested to make sure each brake had a ground and power when the brake controler was sending a signal to activate the brakes and all tested good. Is it possible the brakes need to be replaced already? I can see the shoes have a lot of meat on them still. I've played with them many years ago and know they use an electromagnet to actuate the brakes. In the 3 years I've owned this trailer it's probably only has 10k miles on it. It goes out regularly but only for short local runs. It has lippert axles on it which are a copy of a dexter axle in 10000 pound rating. The whole brake assemblies only cost $100 or so per axle. I just can't believe they're not working properly already. They have to last longer than that. Anyone know these electric brakes well that can point me in the right direction?

 

I have spun the wheels to get them to actuate. That I did figure out already. The wiring was pretty shotty on the trailer when I purchased it and I did solder everything and shrink wrap it. I'm pretty sure it's not a wiring problem but I'm going to crawl under it today with a battery and see if I can directly charge each brake to see if I get it to work. If that doesn't work it's obviously an internal issue. Looks like the brake wires coming out of the backing plates are the same color so my guess is it doesn't matter which one is positive or negative?

 

I just went out and cut the wires to the axles and directly charged them with a battery and still nothing. Obviously the magnets/components are bad. To be to the brakes, I have to take the hub off and drain the oil to get to the brakes. Kind of a stupid design. I'll probably just buy the whole loaded backing plates instead of replacing the magnets since I have to go all the trouble and replace the oil seals. It just amazes me how these things are junk with so little use. I've go a tag air brake trailer that I've had for 15 years and I've never touched the brakes other than adjusting the slack adjusters. Nothing lasts like it used to, that's for sure.

 

Truth is heavyd, that's exactly what I did with that trailer. I made sure it went out on regular basis. And it still failed. Has to be junk parts. China I'm sure, LOL

 

Can you even convert something that big to hydraulic? It's a 10 ton trailer with 2 10k axles. Have seen them on the smaller trailers but nothing big. Maybe I can do one axle only. I think that's all you need to be legal. One axle that always works is better than 2 that sometimes work.