My Father in Law's 1984 Airstream Limited is one of a small number produced that year with hydraulic disc brakes. recently, the brakes quit working altogether.
What We've already tried: Replaced connection receptacle, ensured 12v
power is getting to the brake controller and the trailer, inspected and found no leaks, found no sign of fluid loss, found and replaced one collapsed vacuum hose.
All of this has not changed the problem. Does anyone have any experience with this brake system? Is there an internal seal that may be failing? Any help is most welcome!