need info on 1997 Safari Serengeti braking system m series

There’s about a zero % chance a Cat dealer will want to have anything to do with a 30 year old RV. CST doesn’t even make RVs. Maybe if there was an engine issue presuming it has a Cat diesel, they might look at it. 
besides that sounds like about the most expensive way to go and the OP seems to be on a quest to diy brake job on a diesel pusher!! Lofty goal. 
Find the chassis mfg and start there.