Technician A says that for an air brake system to be FMVSS-121 compliant,there must be a minimum of 3 air reservoirs on a truck.Technician B says that some OEMs use a single air tank,divided into 3 separate chambers each with its own dump valve to meet FMVSS-121 requirements.Who is correct?

A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Alexandria Taylor · Accepted Answer

Final Answer : C, Explanation :  FMVSS-121 does not specify the number of air reservoirs but focuses on the performance and safety requirements of the air brake system. Some manufacturers use a single tank divided into separate chambers to meet these requirements, making both Technician A and B correct in the context of compliance strategies.

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