idk how your rotars could possibly be warped at 30,000 miles unless someone really drove the piss out of it and the rusty hinges and cylinders could of jjust been from sittong outside i live in wisconsin and with all the snow and salt that gets under your car if you dont do something about it it will rust out fast. Check the bottoms of the doors and check to make sure its not rusting at all down there and if it is do something right away i had to replace the doors on mine because they rusted out so bad from sitting