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To check and see if it is a strut problem push down on the rear of the vehicle. the car should only bounce 1 to 2 times once released go from side to side if it bounces more than 2 times that shows a worn strut. You can also jack the vehicle up and check the rear tire for play. if you have play it could be a strut or a trailing arm bushing.
I would say if you have those type issues in the back, you may want to install new struts on all four corners, as well as new stabilizer bushings & links
A GM dealer can tell you if you give him the VIN number, but the simplest way is to check one of the rear struts for an electrical connection (will also have a leveling air line connection). If there is one, you have a road sensing suspension (RSS) with rear leveling capability - if not, just air shocks. If you have RSS, these struts are very expensive and notoriously unreliable, and you may want to replace them with air shocks. However, if you do this you will have to trick the RSS into thinking they are still there by terminating each electrical connector with a resistor (see the Cadillac Forums website).
will try to help!with your car in park on level ground, try bouncing your car up and down by pushing down on rear of car, maybe trunk deck or rear bumper. just someting safe to push down on body of car downward. if the car bounces up and down twice on it's own, after pushing it down hard, your answer is a bad rear strut,[note] if you intend to replace 1 rear strut,,please do both rear, it will improve your ride, plus save you from doing 1 at a time. THANK YOU FOR CHOOSING FIXYA.COM!!
Actually, these are struts, and you need two new ones. You do not have an air suspension unless someone added one.
You will need a spring compressor to replace. The replacement struts can be bought for around $200 (ea) fully assembled, you can but the strut only (without springs or mounts) and take it and the old strut to a shop ($15.00 a strut to change spring and mount), or you can have them do the whole thing.
push down hard on back end then release suddenly,should bounce up then level straight away,if it continues to bounce,one side or the other then replace both shockers(match pair) easy job.
It's likely caused by a worn out strut or struts in the rear. You hit a bump and the wheel bounces because the strut is not damping properly. This causes an effect sort of like riding on only 3 wheels because the bouncing wheel is not supporting the vehicle steadily while it's hopping.
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