Join Date: Sep 2007
Location: Colorado, USA
Drives: 2013 Kia Rio LX Sedan, 2004 Mitsubishi Montero Limited, 2008 Suzuki GSX650F, 1985 Kawasaki LTD 454
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Brakes are a difficult item when it comes to warranty. I agree with SorentoLX that most brake failures are the result of improper use or over-use. Sometimes the warping can also be caused or accellerated by over-tightening wheel nuts.
I have seen people driving down Pikes Peak (14,110 ft.) with their foot on the brake continuously, instead of using a proper low gear. That's 19 miles downhill! And then they're surprised their brakes are all messed up.
On the other hand though, the car manufacturer has to make sure that the brakes are designed properly for its intended use. In case of the Sorento, that means stopping a loaded car (passengers + cargo) and a trailer up to 5,000 lbs.
Based on what I've read so far about the Sorento brakes is that they might be a little underpowered. So even if you drive it right and don't exceed your payload or trailer weight, the discs still warp early. I believe that should be covered by warranty.
Problem #1 is that no party (neither the owner, nor KIA) can ever proof how the brakes were used. So it will probably be at dealer's discretion whether or not they will cover it.
Problem #2 is that if you are lucky enough to get new brakes under warranty, you get the same quality discs and pads you had before. So they'll warp again.
To avoid both problems, many have turned to aftermarket brakes.