We don't assume he has hyd. brakes. He says he has a 38 ft. bounder, not diesel. A gas Bounder has hyd. brakes. Why should he cancel his trip because of brake fluid? Just change the fluid. It is that simple. I am one of those people who goes nuts about people being paranoid in a motorhome. Don't get up underway, Don't drive with the propane on, Etc. We do all these things. However brakes are the most important item on a motorhome. I would ten times rather break down and not be able to move than lose brakes on a mountain grade. A motorhome is a heavy vehicle. Brakes are a friction device. They trade heat for motion. The heavier the vehicle the more friction is required to slow it down. This heat goes through the pad, through the piston, and into the brake fluid in the caliper. As your own chart showed you, moisture lowers the boiling point of the fluid. I am not trying to argue with you or keep this post going, I just can't let someone give terrible advice to other people who might not know better.