bluedirector

Hey guys, I have a 2003 Mercedes-Benz s430 and I replaced the left rear air strut a couple days ago. After the install the previous leaking sound had gone away only issue was it drove kind of bumpy which I assumed was because it was a new shock and it had to be broken in. 3 days later I noticed the same hissing sound coming from the same wheel as well as now there is a terrible squealing sound as well. I installed the air strut myself and I did it correctly Im hoping someone can give me some insight on whats causing this hissing and squealing. My guess for the squealing is the balljoints but I'm not sure, the hissing I have absolutely no clue because its a brand new strut. All replies are appreciated thanks so much in advance!