When should shock absorbers be replaced?

Generally speaking, if the shock absorber is noisy, too hard, too soft, or has oil leakage, it is necessary to consider replacing it. However, when the above problems are found, do not judge the replacement of the shock absorber prematurely. If there is a sound, you need to check whether the installation is correct. If it is too hard or too soft, check whether there is any problem with the spring and the fixed connection shock absorber. For oil leakage, check whether the cylinder head is tight.