don't know if you have a class c or a ? if it is a class c any good parts store will be able to get parts as will be for heavy duty van ,i have replaced a lot of the brakes parts on my 1984 Midas class c on all came from local part store and you needs a Chilton, Haynes,or a factory service manual for the chassis not the coach .
if it is a class a i don't have any experience with them but would be a truck chassis to my thinking still need repair manual for ford that year.
but be fore warned ford has sense of humor they do a lot of split year and running changes my 1984 takes 1985 and up wheels you will get into this if you have 16.5 wheels.
good luck and happy traveling