Indiana Code Title 9. Motor Vehicles § 9-19-3-3

Sec. 3. Subject to section 4 of this chapter, a trailer or semitrailer of a gross weight of at least three thousand (3,000) pounds, when operated upon a highway, must be equipped with brakes adequate to control the movement of and to stop and to hold the vehicle. The brakes must be designed so that the driver of the towing motor vehicle can apply the brakes from the cab, and must be designed and connected so that the brakes will be automatically applied in an accidental breakaway of the towed vehicle.