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The suggested brake fluid for the 2012 Hyundai Sonata is DOT 3, but DOT 4 can also be used without any noticeable difference during normal driving. DOT 4 is more expensive due to its higher boiling point, which can be advantageous for performance situations. However, for regular everyday use, you won't see any benefits that justify the higher cost. If you happen to have extra DOT 4 on hand, feel free to use it in your vehicle.
The type of brake fluid recommended for the 2012 Hyundai Sonata is DOT 3.