The brakes not releasing after a long hill where the brakes got hot is a indication that the brake fluid has gotten hot also and has expanded. This in turn keeps the pressure on the wheel cylinders. In my opinion, I would have two things done. First, I would have the brake linings inspected for wear, and proper adjustment to the brake drum. At the same time, have them check the brake wheel cylinders for leaking and other abnormalities. If all is well, then have them change out the brake fluid and replace with new high temperature rated disk brake fluid. Don't remember which one it is, but brake fluid is rated by "DOT #". Also, since all brake fluid is hygroscopic in nature, it should be replaced every two years by having the brake system bleed and refilled with the same type of fluid. Before anyone takes the previous statement to task, there is one exception to the hygroscopic rule. That is silicone brake fluid. This fluid is extremely good for trailer applications, however, all hydraulic parts of the system must be rebuilt before using silicone brake fluid. Once silicone brake fluid is installed, there is no need to change it at all. The only thing to do is watch the brake lines for rusting from the outside to the inside. With standard brake fluid, since it is hygroscopic, you have to be concerned with the brake lines rusting from the inside to the outside. This is a greater concern with older equipment. Any brake system that uses hygroscopic brake fluid that hasn't been changed regularly will eventually have the lines rust out from the inside. The best way to check the brake lines on a surge brake trailer is to do a 10 mph panic stop on a secluded road. Do this two or three times and if there is a weak line, it will blow out usually. Better to have this happen under a controlled situation than happen on the road when you most need the brakes. There is nothing worse than having the trailer steering the tow vehicle. /forums/images/graemlins/frown.gif /forums/images/graemlins/crazy.gif
