Question Trailers built before 1975 are: Answers Required to have spring brakes. Not required to have spring brakes. Unsafe to drive. Prohibited from public roadways. Explanation Trailers built before 1975 are not required to have spring brakes. When parking a trailer without spring brakes, be sure to use wheel chocks to prevent the trailer from rolling. Take a FREE Practice Test Now This questions appears in the following tests: Texas Double , Connecticut Combination , Nevada Combination ,