Brake problem

I'm going to guess that your brake fluid had gotten hot during the drive to the campsite and what you experienced was the water in the fluid actually started to boil. If the pedal is up after things have cooled down, water in your brake fluid is the cause of your problem. It is recommended that your brake fluid be FLUSHED and changed every few years. Having your brake fluid flushed is NOT the same as just bleeding the brakes. On my coach it takes about 3 quarts of fluid to completely change all of the fluid in the calipers, the master cylinder, and all of the brake lines. Make sure that the mechanic also knows how to get the air out of your ABS(anti-lock brake system) when he is finished.