What is happening with the brakes on the trailer?? Is it jabbing?? If the trailer is not perfectly level, it will cause the brakes prematurely apply if the front is low. If it is high, they may not work at all. Depending on the brand of controller, there usually a gas charged shock to keep the actuator applying under deceleration and to keep the brakes from jabbing. As far as the disc brake conversion, they will apply smoother, firmer, and brake harder. You will need to check your actuator if you convert. Some actuators are not compatible with disc brakes, some of them you can convert by removing an orifice or swapping a fitting. I bought a new actuator to be safe.