Issue
Hazard description
On certain W9000 vehicles manufactured between 10-2-75 and 22-4-75. Pipe plugs incorrectly released for installation in the exhaust port of the trailer air supply valve. When the trailer parking brake is released, air trapped in the trailer air supply valve will prevent a piston in the lower portion of the valve from opening, causing a gradual loss of air pressure in the trailer service brake system with each service brake application, and with no advanced warning to the driver.
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