there is a noise in the bottom right side in the frame. on 2008 Hyundai Tiburon

Noise sounds like a bathtub full of water. When brakes are applied water sloshes back and forth. What is the cause?

Asked by for the 2008 Hyundai Tiburon
somewhere around the passenger's side of the firewall there is a water drain, they are known to get clogged up and cause a severe moisture build up. have a mechanic look at it and they may be able to blow it out with an air hose.