Electric trailer brakes, 1 wheel locks up

[garlicbreath]

I bought a used car hauler, 8k capacity, 2 axle, electric brakes.
I noticed when I am on a loose surface one wheel locks up.
It looks maintained from what I can see. All the wiring is good, bearings are clean and greased, tires are near new. Obvious stuff of course.
I have never dug into trailer brakes before and have no clue how electric ones work.

What could be some possible problems and things to look for?

The second question is it's rated for 8k, dry weight is 2400, what would the axles likely be rated at?

[SuperCrutyPS]

You can go to Dexter Axle - Trailer Axles and Running Gear Components - Home - Click on this icon (left side)
http://pl.b5z.net/i/u/6149609/i/Genu...Bar_Radius.jpg

That opens a .pdf file. In that file it shows what the brakes look like.

What happens is when you step on the brake, the brake controller sends a voltage to the magnet. (The rectangular piece near the bottom. It then grabs the drum and a cam at the top pushes the shoes out against the drum.

The trailer brakes I've seen are adjustable like old car drum brakes. So you may be able to adjust that one shoe so it won't lock up.

Not sure on the axle rating.

[WD40]

What wheel is locking up? I say it's the right rear or left front.
I would pull the wheel and check the brake shoe for oil or grease.
Do the wheels have grease or oil bath wheel bearings?
You say it's rated for 8K, is this a two car hauler?
As you can tell we need to know a lot more, about your trailer.
Doug

[garlicbreath]

It's an International Trailer corp 18 foot trailer.
Has an id tag with the 8k rating. I can't find any info on it online.
The bearings are grease, I am not familiar with oil bath bearings.

[nitrogen]

more likely it is the only brake grabbing at all. start by properly adjusting all four, test to make sure all of them are getting power, look for damaged wiring from the brake backing plate up to the plug

[garlicbreath]

You are right Sir,

It was the only one working.

All the wiring checked out good. The other three brakes needed to be adjusted.