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Basically a strut is a combination shock absorber and spring. There are used mostly on unibody cars to support the weight of the cars (spring) and dampen road shock (absorber). If the back strut is bad, then the gas inside has started to get past the rubber seal of the strut. Less gas means less compression, less compression means less dampening. This will lead to more wear on just about every other part of the car. Sometimes struts break, or the mount can go bad. It is a good idea to replace the mount at the same time as the strut.

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Q: Would you explain to me what a bad back strut is?
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