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I have an MCI 7 that is leaking air through the exhaust port of the brake relay valve when the engine is running. This leak is very big!. I replaced the relay valve with a new one and it is still doing the same thing. This system is unable to keep up with the leak. When I release the brakes as if I was going to drive it then it builds pressure but still continues to loose pressure. It goes from 90 to 120 continously. When the brakes are on the entire system just dumps and the compressor is unable to get the air pressure past 60 pounds.
email John Jamieson
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