One problem related to abs brake fail has been reported for the 2011 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Hyundai Sonata based on all problems reported for the 2011 Sonata.
I have a 2011 Sonata limited. Earlier this year I began having a starting issue where the car would say "apply brake pedal to start" even though my foot was firmly planted on the brake. Took the car in and they couldn't duplicate so I just kept on working around it. In June, it got worse so I took it back, spoke to the service manager at the dealership and they ordered a brake switch and new push button ignition on June 20th or thereabouts. The parts finally arrived on August 17th. . Yes. . It took that long apparently. I dropped the car off that morning and went back that afternoon around 5. I was informed that they had replaced the brake switch and push button but when they went to test drive, they lost steering control and the eps and traction control system had failed. They took a part off a new Sonata in their lot and put it on my car but that did not correct the problem. After 2 days of troubleshooting they managed to correct that issue but as soon as they did, the abs light came on and it stated the abs system had failed too. I am now waiting on a part for the abs as of 8/22. None of these systems had issues prior to the drop off date. This concerns me that there may be a serious problem with the electrical system. We will see when they replace the abs module if something else goes wrong.