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

Question

lawrence zumwalt · Accepted Answer

Final Answer : A, Explanation :  Technician A is correct because it is normal for the primary circuit to have a slightly higher pressure than the secondary circuit in a dual circuit foot valve during testing. This difference ensures proper distribution of braking force. Technician B's statement about warped trailer air disc brake rotors causing foot valve chatter is incorrect; foot valve chatter is more likely related to issues within the valve itself or the air system, not the condition of brake rotors.

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