Technician A says that when testing the performance of a dual circuit foot valve, it is normal to measure about 2 psi (14 kPa) higher pressure in the outbound primary circuit than in the outbound secondary circuit. Technician B says that warped trailer air disc brake rotors can cause foot valve chatter during service applications. Who is correct?
A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B
Answer: A
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