Sounds like one off the rear shock struts is sticking
common problem
had one off my rear shocks do the same thing on the rear of my wrx wagon
I replaced all my shock struts and installed new lowered springs while it was done
Not had any problem with knocking since replacement ... Have search on the forum in Mechanical section
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Last edited by Tiigga; 22-08-2015 at 09:05 PM.
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