One problem related to brake disc caliper has been reported for the 2011 Hyundai Elantra.
At 17k miles, and my 4th oil change at the dealership, I was informed that Hyundai recommended the rear brakes be lubricated at 15k miles to avoid future issues with the calipers/pads/rotors. I found this to be very unusual because the front brakes should be doing most of the braking on these front wheel drive cars and they only mentioned the issue happening with the rear brakes. I told them if this was actually true then there must be a manufacturer defect as I have never had this occur with any of the other foreign cars we have owned in the last 10 years. ( 4 Honda's, 2 Subaru's) this dealership is actually being proactive in that they are trying to prevent higher future repair costs, they mentioned the rotors having to be replaced if this "preventive maintenance" wasn't performed. Hearing this, I have searched the internet and have found the following: many people reporting rear pads wearing out way earlier than front pads, brake calipers were getting rusted and sticking, eventually seizing, overheating the rear discs and eventually damaging the rotors. There is definitely something defective in the rear braking system if Hyundai admits that the rear brakes should be lubricated at 15k miles. But not the front brakes and that the rear brake pads wear out faster than the front pads.