What Causes the Abnormal Noise When a BMW 5 Series Goes Over Speed Bumps?
3 Answers
Abnormal noise when a BMW 5 Series goes over speed bumps may be caused by damaged oil seal gaskets. Below are the specific reasons and solutions: 1. Specific reasons: The failure or rupture of oil seal gaskets or sealing washers can lead to loosening of the oil reservoir cover nut, requiring replacement of the sealing components. If oil leakage persists, the shock absorber should be removed. If there is a feeling of sticking or uneven resistance, further inspection is needed to determine if the gap between the piston and cylinder is too large, whether the shock absorber piston rod is bent, or if there are scratches or scoring on the piston rod surface and cylinder wall. 2. Solutions: Replace the sealing components; if the shock absorber is faulty, it is necessary to visit a 4S shop for professional repair or replacement by a qualified technician.
My BMW 5 Series has been running for over five years now, and it squeaks several times when going over speed bumps. It feels like the suspension system is aging. The shock absorbers might be leaking oil or have internal valve failure, resulting in poor damping and noise when going over bumps. Another common issue is loose stabilizer bar links, or excessive clearance in the control arm ball joints. Hardened or cracked rubber bushings can also cause squeaking. In winter, when temperatures drop, materials harden and the noises become more noticeable. Last time my car had an issue with the rear suspension, inspection revealed a loose link bolt—tightening it provided temporary relief. Long-term part fatigue is the main cause. During maintenance after tens of thousands of kilometers, have the technician focus on checking the suspension. Although the noises seem minor, ignoring them could accelerate component wear, affecting handling and even safety, so addressing them early is wise. BMWs prioritize driving refinement, so these small issues shouldn’t be neglected.
I think the abnormal noise in BMWs mostly originates from shock absorbers. After prolonged use, the oil seals of shock absorbers may rupture or the damping may fail, causing rattling noises when passing over speed bumps due to significant load changes. Electronic shock absorber models may also involve sensor or module malfunctions. Additionally, worn stabilizer bar bushings can cause metal friction noises. It is recommended to check the shock absorbers for oil leakage. If there are no obvious damages, perform a compression test for further diagnosis. Abnormal noises are not just annoying; they also reduce suspension performance, leading to decreased stability during sharp turns and posing risks. Professional diagnostic tools are the best solution—don't compromise on parts to save money. Regular maintenance, such as replacing bushings, can prevent issues and ensure a smooth driving experience.
