One problem related to brake disc pads has been reported for the 2004 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Hyundai Sonata based on all problems reported for the 2004 Sonata.
Disc brake pad separation resulted in severe rotor wear and loss of brakes on all four wheels. Low mileage on vehicle, 19k, original brake pads. Replaced rotors and brake pads, old parts available.