For the past couple of weeks I've had trouble with my brakes. When i put the brakes on it seems like my trailer brakes dont even work sometimes. The trailer is just a year old, but since i've had it they have had some type of delay in them. Is this common? No matter how much i adust the box inside the truck i still have some type of problem, either they will grab to much or not enough. The trailer is a 6.5/16ft trailer.