Brake installation:
Remove the dust cap, then the cotter pin, nut, washer, bearing, then pull the hub:
Not much grease in there:
Parts:
Not much grease in the back side:
Next task is to pull the seal and remove the bearing for reuse. If this trailer was used, I'd replace the bearings instead of reusing them. Since the trailer is new, I reused the bearings. I also put more grease in when reassembling.
The backing plate (brake assembly) bolts to the flange on the axle. Not all trailer axles have the flange. The sales and service guys at the dealer said this same model trailer didn't previously have a flange on the axle, so I checked this trailer for presence of the flange before committing to buy it.
I spliced the wires with heat shrink crimp connectors.