The front left suspension of my sister's Civic squeaking when she drove over small bumps or broken surface. I removed the tire, checked and tightened everything, and everything looked to be OK. But the squeaking still exists. When bounced the left front up and down, the noise was inconsistent. I suspected the squeak seemed to come from the upper strut mount. I removed the top rubber strut cap and lubricated it with a generous amount of penetrating oil, the noise was gone. It was gone for few days now. If you have the same problem,try to lubricate the strut mount. This may be the culprit.