this might be a dumb question but o well and I havnt been able to find anything on this so idk if this is normal or if anyone has had or heard of a similar thing but when I brake hard, I hear this noise towards the rear of the car that sounds like someone is flicking a spring. just like how when you were little you would play with the springy door stops your parents would put on the wall so when u flung open the door you wouldn't put the door handle thru the wall. well it sounds identical to that. if anyone can help or has an idea of y or what might be going on that would great