Interpretation ID: aiam1740

Mr. J. L. Brown, President, Brown Truck and Trailer Mfg. Co., P.O. Box 1281, Charlotte, NC 28201; Mr. J. L. Brown
President
Brown Truck and Trailer Mfg. Co.
P.O. Box 1281
Charlotte
NC 28201;

Dear Mr. Brown: This responds to your December 11, 1974, question whether Standard No 121, *Air brake systems*, or any other Federal brake regulation applies to trailers that are equipped with electric brakes. In a January 2, 1975, telephone conversation with Mr. Herlihy of this office, you indicated that the brake system on your products is entirely electrical.; No Federal braking standards apply to your electrically-brake trailers. Standard No. 121 applies only to trucks, buses, and trailers that the manufacturer chooses to equip with an air brake system.; Yours truly, Richard B. Dyson, Acting Chief Counsel