Monterey Bay Cruzers wrote:
... since the brakes seemed fine on our 5 mile trip to the RV park... (were the brakes just hot from the stop and go traffic?) Should we continue on our way home? Our RV is a 1998 Fleetwood Pace Arrow. We only have 23,000 on it.
When was the last time you have the brake fluid flushed? This does sound exactly like a moisture in the brake fluid problem... Both of your symptoms (fluid leaking from the master cylinder, soft brakes) match, and as well the fact the brakes worked OK after cooling is another flag that you may need a brake fluid flush.