89 trailboss 250 rs/e rear brake

i received the quad in pieces and have had to assemble it.

i can not figure out how to assemble the rear brake system. its a small disc and caliper that goes on a spline under the right rear fender. a lay out, diagram or step by step instructions would be appreciated

also looking to rid myself of the oil pump system and to just do the premix. is there a kit i need or just plug the line?