Listening noises from your auto often is never comforting, so discovering noises on your smart forfour suspensions when you go over a speed bump can be disturbing. This warning sign may be a sign of a small trouble as well as a warning of a much larger repair to come. In any case, it is essential to check the origin and take the necessary actions to eliminate the trouble, it is with this objective in mind that we wanted to write this document to help you see more clearly. We will first see the possible reasons for a crack when the speed bump passes, then, what can be the cause of a squeaking noise when a speed bump is being passed and finally what to do if you have another noise when a speed bump is passed.
Suspension cracking noise smart forfour
Check smart forfour suspension
If you notice a suspension noise when you pass a speed bump on your smart forfour, and it is categorized by a “clack” or cracking, it is highly possible that your suspension block is the cause of it. In fact, it may be the suspension cups, which, when they are out of date, have the rubber (silentblock) that acts as a buffer and shock absorber for the upper part of the suspension that no longer fulfils its function during small bumps that compress the suspensions. To examine if this is the trouble that worries you, take a dented road and focus on the noise coming from your front axle as you go over holes. If it is indeed the cups, think of replacing them as soon as possible or you may damage other parts and have to make more important repairs.
Check the cardan shaft
If you are here because you have searched for “smart forfour suspension noise” and the suspension is not the cause of your problem, it may be that the cardan shaft is responsible. In fact, when the cardan bellows get out of date and the dirt/dust accumulates inside them their functions is degraded and it is possible to experience a noise when they are in torsion. To examine this, you can try both types of torsion, first vertical with suspension compressions on the speed bump passages, and horizontal when you are going to turn at low speed. If it cracks in these two circumstances you should consider swapping it or them. If you have the feeling that this noise is more like a a loud noise on smart forfour, don’t hesitate to consult this article.
Check steering hinges/stabilizer bar
Finally, when you experience a suspension noise when your smart forfour passes over a speed bumps, it is imaginable that the hinges or the stabilizer bar are responsible. Exactly like the gimbals, the steering part is mobilized when you modify direction. If this is your situation, the parts that may have been affected by usual wear and tear or impacts (e. g. sidewalks). The steering hinges, the stabilizer bar hinges. can be the causes of your noises, to examine it, position it under the vehicle and apply twists on each of its components to examine that there is no particular play on one of them, they are supposed to endure you quite strongly over their entire travel. Please remember to take your vehicle to your mechanic or replace them if they are involved.
squeaky noise speed bump smart forfour
Check the stabilizer bar
If, however, you have a noise that is more like a squeak when you go over a speed bump with your smart forfour, it is possible that it is the stabilizer bar itself that is concerned. In fact, abnormal/pronounced wear of the latter can cause irregular friction which can cause this squeaking noise. Remember to examine by going under your vehicle the condition of the paint on your bar which will reveal if there is friction. Second possible explanation, it may be your stabilizer bar silentblocks that are dry and create noise, in which case take them out from the cradle and grease them, this should solve the trouble.
Check engine silentblocks
Finally, last possibility that we can examine together, it is the engine silentblocks, actually, these silentblocks operate as pads/shock absorbers between the engine and the cradle of the auto, a obvious weakness of these will generate a subsidence and therefore a space between the engine and the silentblocks, it may happen that a squeaking noise occurs when you pass a speed bumps or any holes with your smart forfour. To replace them go to your auto technician.
Other speed bump noise smart forfour
If, even though all its assumptions, you still can’t find the source of the noise your smart forfour makes when you pass a speed bump, we advise you to refer to this content on a loud noise on smart forfour or to visit your mechanic in order to carry an in-depth check on your smart forfour and determine this trouble.
