Second Opinion on Grinding Noise (2007 Elantra)

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Hi folks,

My sister has a 2007 Hyundai Elantra. She lives in Washington, DC, but was in California since mid-December visiting family and for medical reasons (long story, but everything has been fixed up).

During this time, her Elantra was sitting outside, in a driveway, in DC. During this time, it's been quite cold, snowed several times, etc.

Upon returning to DC, she started the car (it started right up), warmed it up for a few minutes, and then attempted to back out of the driveway. She stopped immediately, as it was making a horrible grinding sound that wasn't easily localized. It made no unusual sounds while stationary, and idled just fine.

She called the dealer, explained the situation, and their service advisor said it was likely that the sound was from rusted brake rotors. Although it might make horrible sounds for a few miles, the pads would eventually abrade the rust off with no damage or other problems.

She called me to ask if this seemed reasonable. This seems like a rather plausible explanation, and I'm inclined to agree with the service advisor.

I figured I'd check with BITOG for a second opinion, just in case.

For what it's worth, the car's been regularly serviced at the Hyundai dealer, on schedule, since it was purchased. It's normally her commuter car, and she's never had any mechanical issues before, nor has the car sat idle for more than a week or so since she's owned it.

Any thoughts?
 
Rusted brake rotors can make very horrible grinding sound. She should drive the car slowly and apply the brake lightly for several hundred yards, the pads would abrade the rust off the rotors.
 
My 2003 Elantra does this every morning when I back out but by the time I'm out of the driveway it stops. Since the car has not been driven in a while it may take a few miles.
 
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Brake rotors would get to us with some surface rust on a humid day 15 minutes after they were re-cut when we sent them out.
After a few days with some rotors in wet weather, it makes them look 10 years old!
 
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