The two-way check valve (Fig. 35) allows control of the trailer brake by use of the hand valve or foot valve. This valve will permit air to flow from the source that is supplying the higher application pressure. Two-way check valves are installed between the hand valve and the tractor protection valve, and between the foot valve and the tractor protection valve. Two-way check valves can permit a higher brake application to the trailer than the truck.
Air Brake Manual
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