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Why is air blowing from service line?

with glad hands disconnected,blows air from blue service line while applying service brakes with foot peddle. what valve would i start with?

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both red and blue lines disconnected...red button in...press on peddle, blows profusely out blue line..red does nothing

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told you wrong...sorry...red valve on dash is out, yellow is pushed in...

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That's what it's supposed to do - you apply the brake pedal and the air is sent through the blue line...unless i misunderstood your question.

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Ok, then i think your tractor protection valve (the one in the dash) went out. Not the cheapest part but simple to replace.

Bump for Keith on this one.

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If your trailer brake valve is pulled and you push on the brake pedal and get air out of your blue air line, the parking brake valve is faulty. However if your trailer brake is released, the blue line loose and you push on the brake you should get air out of it... Make sure the trailer parking brake is set.

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What is happening with the red line while this is happening? Are both lines disconnected from trailer? Is red button on dash in or out?

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You have creeping crud or water in your air system. I'd try using some bendix air brake conditioner. It comes in a gallon can with a straw to get it in the system.

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spencer boothe will be eternally grateful.
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