Knocking noise coming from the back????

munchman s3

Gas it
Joined
Mar 7, 2009
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when am out and about theres a knocking noise coming from the back. Its more of a low clucking noise, but only really able to hear it when driving over speedbumps.
If you bounce the back end you can hear it aswell, i aint had chance to stick it on the ramps at work but i got a feeling its the shocks or the bushes. Anyone had any similar problems or know exactly what this is?

cheers munch