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Park brake


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we had same problem on truck, been a while but there is a double shuttle valve around the back of the cab in the frame, it has a shuttle valve in it that sticks. trace the supply line from the valve it should go to the double shuttle valve. I think it feeds air from two tanks and it get stuck on one side and can't get enought volume. If i remember right it is about 4" long, air line in each end and air line in the middle supplies air to the parking brake valve.

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