What is the primary purpose of the trailer brakes?

The primary purpose of trailer brakes is to aid in slowing down and stopping the trailer effectively. When a driver applies the brakes in a towing vehicle, the trailer brakes activate to ensure that both the vehicle and the trailer decelerate in a coordinated manner. This is particularly important for safety reasons, as trailers can add significant weight and can sway or push against the towing vehicle during braking, which can lead to loss of control if not managed properly. By having independent braking on the trailer, it allows for smoother stops and reduces the risk of skidding or jackknifing, enhancing the safety of both the trailer and the towing vehicle.

Maintaining speed on inclines, assisting in acceleration, or padding the load are not the primary functions of trailer brakes, as they do not contribute directly to the control and stability required during stopping and deceleration.