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If the air compressor should develop a leak, what will keep the air in the tanks?

A The one-way check valve
Federal regulations require a one-way check valve or an equivalent device to be located at the entrance to the first air tank. (In a dual air brake system, there must be a one-way check valve at the entrance to both the primary and secondary air tanks.) If the air compressor or the line connecting it to the air tank develops a leak, the one-way check valve will prevent the air from going out.
B The tractor protection valve
C The emergency relay valve