Hi have this problem with my hhr 2008. When i am reaching 40 mph it hear a hard knocking and the car shake a little too. We change struts. Sway arm bushing. Check brake pads. But nothing help. Does anyone had the same problem

 

Welcome. How many miles on the car? Have you checked the lower control arm bushings? There is a big bushing at the rear of the control arm that is known to wear out at high mileage.

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