05 Triton trailer when I come to a stop the brakes on the trailer seems to be working when it puts pressure on the tongue and you can feel the brakes are engaged and holding the truck back when you are at a stop, but when you take off you can feel the brakes release and hear and feel the actuator slid, is this normal or should the brakes release and may be sticking some, if so what do I need to do to free them up?