2012 Nissan Armada Owner's Manual - Page 469

Trailer brakes When towing a trailer load of 3,500 lbs. (1,587 kg) or more, trailers with a brake system MUST be used. However, most states require a separate braking system on trailers with a loaded weight above a specific amount. Make sure the trailer meets the local regulations and the regulations where you plan to tow. Several types of braking systems are available. Surge Brakes - The surge brake actuator is mounted on the trailer tongue with a hydraulic line running to each trailer wheel. Surge brakes are activated by the trailer pushing against the hitch ball when the tow vehicle is braking. Hydraulic surge brakes are common on rental trailers and some boat trailers. In this type of system, there is no hydraulic or electric connection for brake operation between the tow vehicle and the trailer. Electric Trailer Brakes - Electric braking systems are activated by an electronic signal sent from a trailer brake controller (special brakesensing module). If electric trailer brakes are used, see "Electric trailer brake controller" in this section. Have a professional supplier of towing equipment make sure the trailer brakes are properly installed and demonstrate proper brake function testing. WARNING Never connect a trailer brake system directly to the vehicle brake system. LTI0117 example Electric trailer brake controller Trailers equipped with electric brakes may require the installation of an aftermarket trailer brake controller. Your vehicle is equipped with a connector and jumper harness that is specifically designed to be used when installing an aftermarket brake controller. 9-26 Technical and consumer information