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Question:

Spring brakes are not required on trailers and dollies built before _________.

A 1975.
explanation

Trailer Service, Parking and Emergency Brakes: Newer trailers have spring brakes just like trucks and truck tractors. However, converter dollies and trailers built before 1975 are not required to have spring brakes. Those that do not have spring brakes have emergency brakes that work from the air stored in the trailer air tank.

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