The compressor only runs as needed to keep up pressure. Not sure what you mean when you say "the brake stops working". Once the compressor has built up pressure in the internal air cylinder, the brake pedal is activated by a signal from the coach braking system. I'm not familiar with the details of your system, but there is probably also a test button on the brake unt itself, to give you visual proof it works.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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