Brake controller overview
Why electric-brake trailers need a controller in the tow vehicle.
Watch on YouTube
Braked trailers need more than a hitch and a ball. Electric brakes want a controller in the tow vehicle and a charged breakaway kit on the trailer. Surge brakes handle stopping at the coupler without a controller. Match the system you actually have before the first loaded trip.

Electric brakes use magnets at the trailer drums or discs, powered and modulated by a brake controller in the tow vehicle through a seven-way plug. Surge brakes use a hydraulic coupler that applies trailer brakes when the tow vehicle decelerates. Surge setups do not need a brake controller, but they still need regular inspection of the actuator and fluid.
Canadian provincial rules set when trailer brakes are required by weight. Stay inside those rules and inside the trailer maker guidance. If the trailer already has electric brakes, plan the controller and breakaway kit as a pair.
A breakaway kit applies the trailer brakes if the trailer separates from the tow vehicle. Keep the battery charged, mount the switch where the cable can pull cleanly, and test the switch before a long trip. Winter storage kills breakaway batteries. Charge before the first spring tow. More cable detail: breakaway cable guide.






Why electric-brake trailers need a controller in the tow vehicle.
Watch on YouTube