It doesn't have any brakes. It's GVCW is under 2900 lbs which is why on this and similar models they didn't put brakes on it. With the SmartCar it's GCVW is 2300 lbs.
The hubs are the same ones they use on the heavier trailers so brakes can be added. I'll be adding them myself. I just need to buy the brakes and wire them in. I found some at Cabela's that are electric disk brakes. Much smaller and lighter weight so I'm going to look at those.