If they develop problems of leakage in the case of front suspension shock absorbers or coil springs failure in their damping capacity or if there is cosmetic failure like sagging or cracked coil springs then it is advisable to disassemble the front suspension shock absorber or the coil springs and overhaul them. The shock absorbers cannot be refurbished-they should be replaced if defects are found-while the springs and other parts may be interchanged. As a result components located on both sides of the vehicle have to be replaced at the same time, and the body will also have to have its characteristics balanced on both sides. Once the assembly has been ripped from the car, wipe off all outer surface grime and then clamp it into a vise. Place coil spring compressor tools on to the springs, making sure that they engage fully, and reduce spring force until there is no force on upper mount. Take an Allen key and grip the shok absorber piston rod then use a box-end wrench to remove the thrust bearing retaining nut. Pull the top mount and the upper spring seat out, the spring as well, the boot should follow the bump stop. If a new spring is desired, then, the original spring can be gently removed from the compressor without breaking the compression; if the spring is to be reused, it is already compressed. When the strut assembly has been dismantled, help should be taken to inspect the parts for any sign of wear and tear, with particular emphasis on the bearing, which should turn smoothly; obviously, such parts that are found to be worn or damaged should be replaced. For investigation detail examine the shock for the sign of leakage in the fluid, examine the piston rod of the shock for pitting and also the external body of the shock. Manipulate the shock through full and short strokes to determine the feel, trying to confirm if the resistance is anyhow jerky or intermittent; any such sign or visible any wear and tear on the faces of the piston should lead to the shock's replacement. Reassembly is almost an opposite reverse process in which it has to be ensured that the paint mark of the coil springs is facing downwards, the coil spring ends are properly set in the upper and lower seats release the compressor and finally tighten the nut of the piston rod to the specified value of torque.