Hearing noises from your automobile often is never reassuring, so listening noises on your Mercedes Classe M suspensions when you pass a speed bump can be stressful. This warning sign may be a sign of a small trouble as well as a warning of a much larger repair to come. Whatever the case, it is important to check the source and take the necessary actions to solve the trouble, it is with this goal 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, after that, 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 Mercedes Classe M
Check Mercedes Classe M suspension
If you experience a suspension noise when you pass a speed bump on your Mercedes Classe M, 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 dead, have the rubber (silentblock) that acts as a buffer and shock absorber for the upper part of the suspension that no longer fulfils its job during small bumps that compress the suspensions. To check if this is the trouble that concerns you, take a dented road and pay attention to the noise coming from your front axle as you pass over holes. If it is indeed the cups, think of replacing them fairly quickly or you may affect other parts and have to make more important maintenance.
Check the cardan shaft
If you are here because you have researched for “Mercedes Classe M 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 old and the dirt/dust amasses inside them their functions is degraded and it is possible to experience a noise when they are in torsion. To check 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 Mercedes Classe M, don’t hesitate to check out this document.
Check steering hinges/stabilizer bar
Finally, when you know a suspension noise when your Mercedes Classe M passes over a speed bumps, it is possible that the hinges or the stabilizer bar are responsible. Simply like the gimbals, the steering part is mobilized when you adjust direction. If this is your situation, the components that may have been broken by usual wear and tear or impacts (e. g. sidewalks). The steering hinges, the stabilizer bar hinges. can be the origins of your noises, to check it, position it under the vehicle and apply twists on each of its elements to check that there is no particular play on one of them, they are supposed to resist you quite strongly over their entire travel. Please remember to take your Mercedes Classe M to your technician or swap them if they are involved.
squeaky noise speed bump Mercedes Classe M
Check the stabilizer bar
If, alternatively, you have a noise that is more like a squeak when you pass a speed bump with your Mercedes Classe M, it is possible that it is the stabilizer bar itself that is involved. In fact, abnormal/pronounced wear of the latter can cause abnormal friction which can cause this squeaking noise. Please remember to check by going under your vehicle the condition of the paint on your bar which will tell us if there is friction. Second possible explanation, it may be your stabilizer bar silentblocks that are dry and cause noise, in which case disassemble them from the cradle and grease them, this should resolve the trouble.
Check engine silentblocks
Finally, last case that we can check together, it is the engine silentblocks, actually, these silentblocks act as pads/shock absorbers between the engine and the cradle of the automobile, a obvious fatigue of these will create a subsidence and therefore a space between the engine and the silentblocks, it may happen that a squeaking noise happens when you pass a speed bumps or any holes with your Mercedes Classe M. To swap them go to your mechanic.
Other speed bump noise Mercedes Classe M
If, despite all its assumptions, you still can’t uncover the source of the noise your Mercedes Classe M makes when you pass a speed bump, we encourage you to read this content on a loud noise on Mercedes Classe M or to visit your technician in order to carry an in-depth check on your Mercedes Classe M and determine this trouble.
