- 1). Pay attention to how your vehicle behaves when you use the brakes, turn a corner or accelerate. Note any vibrations and how the vehicle performs when you drive on a wet surface or encounter strong wind from the side. If performance is poor in these conditions, suspension may be an issue.
- 2). Use a dynamometric test machine to determine whether the suspension is symmetrical, and to find the suspension's minimum dynamic supporting force. These test machines vary so be sure to consult the instructions that come with the machine you are using.
- 3). Look at the shocks or struts and see if you can find any observable defects or concerns. Check the mountings of the shocks to see if they are broken, weak or corroded. Look over the shock absorber itself to see if the body of it deformed in any way.
- 4). Check the top mount assembly bearing for the struts. Have someone move the steering wheel while you observe whether it binds or the movement is rough.
- 5). Note whether you can see any oil leaking. Also, look at the mounting bushes to see if they are cracked or deformed. Check the piston rods in the shocks. If the piston rods are corroded, it's time to replace the shocks since corrosion will damage the seals and cause oil to leak.
- 6). Bounce the car in the front end and note any binding. If so, it could mean there is a bend strut shaft, and the struts need attention.
- 7). Listen for any noise when you use the breaks or accelerate, or rattling or bumping noises when you drive. Determine if the source of the noise in the front or the back. If you're not sure, have someone ride in the back seat of the vehicle while you drive and compare notes.
- 8). Examine the tires for little concave dents that start to develop, or other irregular wear on the tires. This is an indication that new shocks are likely needed on your Volkswagon Jetta.
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