Charlie,
No that is not normal. You have a leak some where in the air brake system. When I bought my coach I too had a braking system air leak. I had a fitting leaking on the air brake pedal valve. It was a simple fix. The air brake valve is connected to the brake pedal under the dash. Another place to give a close inspection is the air tanks. If the previous owner did not drain the water out of the tanks they can develop air leaks. I found an air leak on one of the air tanks & was able to stop it with JB Weld. If you are going to try to find the leak yourself I used an ultra sonic leak detector. It saved me hours of looking. With the leak detector I found both leaks within a couple of hours. This was after spending many hours with soap & water---which the only thing I accomplished was getting wet!
Good luck.....................
__________________
Steve
Newell
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