Medium and Heavy Trucks
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Hi my name is ***** ***** will be glad to try to help. The brake is spring applied and pressure released. What do you mean it has air but doesnt have air to release? If there is air to the brake chamber to release but the brake is not releasing it means there must be a leak in the chamber itself. Are you hearing an air leak?
thanks for the update. If there is air into the park brake switch but not coming out of the delivery side of the switch, there is a problem in the switch. check the release valve for sticking as well. Remove the top cover and inspect for sludge and corrosion causing the valve to stick. Let me know