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Jan Yoder

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Bought a 1970 r model dump truck that was originally a road tractor. Truck was sitting in field for 6 years. Brakes release with parking brake but when normal brake pressure is applied parking brake valve pops up. With light pressure brakes apply some but any harder pops valve. Brake adjustment is ok. There are no air leaks.. if I hand parking valve down manually and apply brakes hard still no air leaks. Anybody ever encounter this condition. Frustrated in Virginia 

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