Technician A says that in the event of a total failure of the primary circuit in an FMVSS-121 compliant tractor-trailer combination,the rig is designed to be brought safely to a complete stop.Technician B says that in the event of a total failure of the primary circuit the relay section of the treadle valve will be actuated mechanically.Who is correct?

Question

Quizplus · Accepted Answer

Both Technician A and Technician B are correct. FMVSS-121 (Federal Motor Vehicle Safety Standards) ensures that vehicles, including tractor-trailer combinations, have safety features that allow them to be brought to a safe stop in the event of a primary circuit failure. This includes mechanical actuation of the relay section of the treadle valve, which helps in applying the brakes safely.

Technician a Says That in the Event of a Total