Trailer manufacturers do not manufacture their own brakes, they get them from brake manufacturers. First, you need to identify the manufacturer of the brakes installed on your trailer. Venture should be able to tell you this. Contact them at
trailers@venturetrailers.com http://www.venturetrailers.com/index.html
Once you find the manufacturer and model of the brakes, you can look up the manufacturer's website and get the information from them. There are also many articles on the Internet. Do a search.
Replacing brakes on a trailer is pretty straightforward if you are mechanically inclined. In your case, you can just look at the other side if it's unclear how anything is put together.