Ford Chassis 2001 Fleetwood Tioga newbrakes locking .HELP

I just bought a 2001 Ford Chassis Tioga, class c.. On its first long distance trip in mountains it didn't seem to have much power intermittently going uphill. One moment it works and one it seems to be having trouble. It was looked at and it was deemed front brakes had locked up and burnt. The front pads, rotors and calipers were all changed and when that didn't fix problem, a subsequent stop had brake hoses and flush done along with rear pads, rotors and calipers changed. 30 miles later, the same problem was encountered...it appears something in braking system is occasionally locking up and not releasing thus making brakes become super hot and other times it drives fine. I am desperate to find some information on it. I just bought this motorhome and it has 28000 miles on it,it was not driven a lot in its years Inspections prior to purchase revealed no leaks or brake issues. Any help would be greatly appreciated.