What could be causing a creeking noise in my car??

Okay...I just posted a question about a grinding noise in my front driver's side of my 01 camaro. How about a creeking noise? It is not so much a grinding as it is a creeking noise. Very similar to the sound you might here if you were rocking in an old chair. I had suggested before it may be a spring or strut. Could this still be the case? Once again , it is only when I hit any uneven part of the road...dip or bump. Does not happen if I press the brake at all. Please help....hopefully yall may understand this description a bit better. Thank you