Finding out noises from your vehicle regularly is never comforting, so hearing noises on your BMW 7 Series suspensions when you pass a speed bump can be worrying. This sign may be a sign of a small problem as well as a warning of a much larger repair to come. In any case, it is important to check the origin and take the necessary actions to solve the problem, it is with this goal in mind that we wanted to write this document to support you see more clearly. We will first see the possible explanations for a crack when the speed bump passes, then, what can be the reason 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 BMW 7 Series
Check BMW 7 Series suspension
If you notice a suspension noise when you pass a speed bump on your BMW 7 Series, and it is categorized by a “clack” or cracking, it is highly plausible that your suspension block is the origin of it. Indeed, 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 function during small bumps that compress the suspensions. To verify if this is the problem that concerns you, take a dented road and listen to the noise coming from your front axle as you pass over holes. If it is indeed the cups, think of changing them quickly or you may ruin other parts and have to make more important repairs.
Check the cardan shaft
If you are here because you have researched for “BMW 7 Series suspension noise” and the suspension is not the cause of your problem, it may be that the cardan shaft is responsible. Indeed, when the cardan bellows get old and the dirt/dust amasses inside them their working is degraded and it is possible to experience a noise when they are in torsion. To verify 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 conditions you should consider swapping it or them. If you have the feeling that this noise is more like a a loud noise on BMW 7 Series, don’t hesitate to read this content.
Check steering hinges/stabilizer bar
Finally, when you recognise a suspension noise when your BMW 7 Series 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 modify direction. If this is the 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 verify it, place it under the car and apply twists on each of its elements to verify that there is no particular play on one of them, they are meant to resist you quite strongly over their entire travel. Please remember to take your vehicle to your mechanic or change them if they are involved.
squeaky noise speed bump BMW 7 Series
Check the stabilizer bar
If, however, you have a noise that is more like a squeak when you pass a speed bump with your BMW 7 Series, it is plausible that it is the stabilizer bar itself that is involved. Indeed, abnormal/pronounced wear of the latter can cause abnormal friction which can cause this squeaking noise. Please remember to verify by going under your car the condition of the paint on your bar which will reveal if there is friction. Second plausible explanation, it may be your stabilizer bar silentblocks that are dried out and bring on noise, in which case remove them from the cradle and grease them, this should eliminate the problem.
Check engine silentblocks
Finally, last case that we can verify together, it is the engine silentblocks, in fact, these silentblocks function as pads/shock absorbers between the engine and the cradle of the vehicle, a noticable fatigue of these will generate a subsidence and therefore a space between the engine and the silentblocks, it may appear that a squeaking noise shows up when you pass a speed bumps or any holes with your BMW 7 Series. To replace them go to your auto technician.
Other speed bump noise BMW 7 Series
If, despite all its assumptions, you still can’t locate the origin of the noise your BMW 7 Series makes when you pass a speed bump, we suggest you to read this article on a loud noise on BMW 7 Series or to visit your mechanic in order to carry an in-depth check on your BMW 7 Series and determine this problem.
