Brake Disc Rotor Problems of Hyundai XG300

Writer has a 2003 sonata. My drivers rear caliper would wear down the brake pads very fast and the others would be like new. After 2 visits the caliper was replaced. After 2 days of sitting in the garage I'd back the car up and hear grinding. The dealer said it was just rust on the rotor and it stopped after driving a few minutes. After being put in storage over the summer to drive my sports car during the summer I went to driver the sonata. While sitting in the warehouse during summer all four rotors rusted up beyond being able to drive the car safely. And the front calipers seized up. The rotors looked like the car had 150,000 miles on it. I have my sports car stored in the same place through winter and the brakes and rotors are fine in spring. The general manager from the dealer says they will check it out and see what can be done. The car only has 50000 mile on it. I've never seen a cars rotors and brakes do this. Neither has the mechanics I first took it to. The mechanic drove it and had to use the emergency brake to stop the car.

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When the brake pedal was depressed from any speed vehicle vibrated. This was caused by warped brake rotors. Dealership replaced and re surfaced the rotor, but the problem still occurs.

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