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Brake valve air leak

Loosing air pressure from tractor valve knob. It only happens when I push it in and I loose a lot of air. It's not coming from the air lines or trailer. Not are there any leaks under the truck or the hood. It has to be in the dashboard. Any suggestions?

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It sounds like you have a bad air can somewhere or the valve in the cab is bad but I am leaning more towards the bad air can

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Hey Mel thanks for your reply. Would I have to take the dashboard apart to get to the air can or the valve? And about how long would you estimate it to take? Thanks.

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If it's the valve leaking you will have to take dash apart somewhat and depending on what truck you have that valve can be pain in the @%^ to get out

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Thanks for the advice.

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eugene572 will be eternally grateful.
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