They are pretty simple to change, you can see a breakdown in your parts book, There are no service manuals for these tractors.Depending on year model, some have brake shoes, some have discs.
We have the parts books too, Prob. a good idea to have a set.It will have both the Brake shoe and brake disc. diagram, plus all the part numbers.The manuals are cheap $ 15.00 each , we have a set including the engine parts but we need to know which engine you have first.
Some of those had the shoe and others had the disc. Better check before you order, we have both in stock as well as the manuals at http://www.circlegtractorparts.com or give us a call at 662-252-5272.