One problem related to brake loud noise has been reported for the 2007 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2007 Hyundai Sonata based on all problems reported for the 2007 Sonata.
Left rear brake lining failed causing loud noise when I braked. Also brakes took longer to stop. Had I been going faster it may have caused an accident. Hyundai has a problem with the rear calipers seizing up and not releasing thereby wearing the brake pads out in several miles and causing the rear brakes to fail. I also had this same failure at 12,000 miles and Hyundai replaced the pads and the said calipers were ok. Hyundai said this problem occurs in areas were they use a high concentration of chemicals on the road in wintertime. All other manufacturers don't seem to have this problem, my opinion is there is a design defect in the calipers Hyundai uses and the problem should be investigated and fixed before someone gets killed or injured due to a rear wheel brake failure.