2 years ago, I did a brake job on the front of my 98 GC. I replaced a left front caliper, (it was seized), as well as pads, rotors and flex lines for both sides. 3 months later, I wound up having to replace the right front caliper (seized up). 3 months later, I had to replace the left front caliper again. It seized up. 4 months later, the right front caliper seized up. 3 months later, the right front caliper seized up again. 5 months later the right front caliper seized up again. 5 months later the right front caliper seized up again. That was 3 weeks ago. Last night, on my way home, when I pushed the brake pedal, it barely moved but the brakes worked better than ever. By the time I got home the caliper was seized up tight....again. I have tried different parts stores with different suppliers, new, rebuilt, you name it but this problem is persistent. I have even picked 2 of the calipers up from stores in Port Huron, Michigan, (I live in Ontario). Brake fluid here is very expensive ( I have spent in excess of $100 on brake fluid) and it takes me a couple of hours to replace the caliper. I remove the old one to take with me to get around the casting charge so it does take a little longer. I did a pressure test on the brakes to be sure it wasn't the flex line but everything was OK. I also replaced the proportional valves for the back brakes when they started leaking last year, however, that has nothing to do with the problems with the front. I do get a grinding sound in the right rear brake when it has been raining out or wet but it goes away within a couple of blocks. Seems to be typical of brake shoes on Dodge and Plymouth mini vans from around this year. Rear shoes and drums are in excellent condition but I have noticed rust on the shoe linings when I have pulled them apart when they were damp. Cylinders work good and there are no leaks. My main concern is all of these calipers. I just can't wrap my head around all of this. I'm wondering if anyone else has run into this problem and if they found a fix for it.