One problem related to brake drum has been reported for the 2004 Hyundai Elantra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2004 Hyundai Elantra based on all problems reported for the 2004 Elantra.
Loud clunking noise and vibration from rear of car when braking. Took it to dealer and they replaced warped rotors and machined brake drums at 4,400 miles. Problem started again and even worse at 4,700 miles. I will be taking it in today. I'm afraid that after 12,000 miles the warranty will not cover them anymore, even though they are obviously defective and have been from the start.