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Thanks for the replies! What am I looking for to determine if that control valve is working properly? Is there a way to bypass it to determine if that's my problem? Pulled the head off the pump. Piston/cylinder look good. The check valve behind the allen-drive plug on the underside of the pump...

Hello everyone, long time listener first time caller. I apologize if this has been asked before, I have thoroughly searched and haven't found an instance of this particular issue. I have a '65 M35A2 that I cannot seem to get above 60-65psi air pressure. Attempting to resurrect this truck for...