Discovering noises from your car regularly is never reassuring, so listening noises on your Mercedes A class suspensions when you pass a speed bump can be worrying. This symptom may be a sign of a small issue as well as a warning of a much larger repair to come. In any case, it is essential to check the source and take the necessary actions to eliminate the issue, it is with this objective in mind that we wanted to write this article to help you see more clearly. We will first see the possible causes 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 Mercedes A class
Check Mercedes A class suspension
If you experience a suspension noise when you pass a speed bump on your Mercedes A class, and it is characterized by a “clack” or cracking, it is highly plausible 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 issue 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 swapping them as soon as possible or you may damage other parts and have to make more important vehicle repairs.
Check the cardan shaft
If you are here because you have searched for “Mercedes A class 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 cases you should consider changing it or them. If you have the feeling that this noise is more like a a loud noise on Mercedes A class, don’t hesitate to refer to this document.
Check steering hinges/stabilizer bar
Finally, when you know a suspension noise when your Mercedes A class passes over a speed bumps, it is plausible that the hinges or the stabilizer bar are responsible. Simply like the gimbals, the steering part is mobilized when you vary direction. If this is your situation, the components that may have been damaged by normal 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, put it under the car and apply twists on each of its elements to check that there is no special play on one of them, they are meant to endure you quite strongly over their entire travel. Keep in mind to take your Mercedes A class to your auto technician or change them if they are involved.
squeaky noise speed bump Mercedes A class
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 A class, it is plausible that it is the stabilizer bar itself that is involved. In fact, abnormal/pronounced wear of the latter can cause abnormal friction which can provoke this squeaking noise. Remember to check by passing under your car the condition of the paint on your bar which will show if there is friction. Second plausible point, it may be your stabilizer bar silentblocks that are dry and cause noise, in which case remove them from the cradle and grease them, this should fix the issue.
Check engine silentblocks
Finally, last possibility that we can check together, it is the engine silentblocks, actually, these silentblocks process as pads/shock absorbers between the engine and the cradle of the car, a evident fatigue of these will generate 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 A class. To change them go to your auto technician.
Other speed bump noise Mercedes A class
If, despite all its assumptions, you still can’t locate the origin of the noise your Mercedes A class makes when you pass a speed bump, we recommend you to consult this article on a loud noise on Mercedes A class or to visit your auto technician in order to carry an in-depth check on your Mercedes A class and find this issue.
