When the shock absorbers or coil springs may have been worn out (leaked fluid, damping ability, physically damaged, etc.), then investigate all the possibilities before beginning any work since the shock absorber cannot be serviced and it should be replaced in case of any issue. Shock absorber and coil spring assemblies can be purchased on exchange basis which will save time and effort and thus one can check the cost and availability of the parts and disassemble the vehicle. Start by taking out the shock absorber and spring assembly, putting it in a vise with wood or rags to ensure it is not damaged. To decongest the upper spring seat, install a spring compressor that you have followed the instructions of the manufacturer to make sure the spring is evenly compressed. Take out the nut of the shock absorber damper shaft without rotating the shaft, with an Allen wrench or a hex bit, and loosen the nut removal, after which the mounting plate, washer, upper spring seat, and upper spring support are removed. Then remove the dust boot, rubber bump stop and protective cap on the shock absorber piston, and remove the compressed coil spring with considerable care. Take away the lower spring support, and, when required, loosen the lower spring seat to the body of the shock absorber by means of a soft-faced mallet. Once the shock absorber is disassembled, check all parts of the shock absorber to check on its wear and tear replacing them where necessary. Confirm fluid leakage and check function of shock, move damper shaft full and short strokes, should be able to move without interruption; otherwise, change is necessary. In case of any suspicion regarding the status of the coil spring, then take out the spring compressor and check whether it is distorted or cracked and in that case replace it. Check the rest of the components and see whether they are damaged or deteriorated and replace only the suspicious ones. Place the bump stop and boot on the damper shaft and mount the coil spring on the shock absorber, making sure that the spring seat stop aligns well. Assemble upper spring support, spring seat, washer, and upper mounting and make sure that spring seat hole is positioned properly. Install a new damper shaft nut that does not allow spinning the shaft and screw it to the required torque. Lastly, gradually loosen the spring compressor and take it out being careful that the spring ends are in their correct position and the spring compressor and shock absorber assembly is then put back in place.