One problem related to brake hoses, lines/piping, and fittings has been reported for the 2009 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Hyundai Sonata based on all problems reported for the 2009 Sonata.
Rear end of vehicle sways around as if driving on ice. Feels exactly like descriptions of issue with recall 13v354000. Hyundai says vehicle is not included in recall. Excessive play in rear end, and very noticeable burning smell coming from rear end after driving. Causing excessive wear of rear brakes and tires. Has caused rear brake hoses to fail. Occasionally brake pedal sinks to floor while driving in stop and go traffic. While traveling at highway speeds, vehicle feels as if a gust of wind could send it off the road. Need to do a ton of steering to keep the car going straight. Front end was aligned 25,000 miles ago.