Is the thud sound normal when the rear wheels go over a speed bump?
3 Answers
It is normal to hear a thud sound when the rear wheels go over a speed bump. Factors affecting vehicle driving: Vehicle factors mainly refer to the braking system, steering system, and running gear. The technical condition of these components directly affects braking performance, handling performance, and driving stability, thereby reducing reliability. Precautions for driving: Always pay attention to traffic signals while driving. Be cautious at intersections, crosswalks, and stop lines, and increase the following distance, especially when behind large vehicles. Use seat belts correctly, as they provide protection no less than airbags in the event of a severe collision.
I've driven quite a few cars, and that 'thud' sound when rear wheels go over speed bumps isn't necessarily normal. The shock absorbers and springs in the suspension system are designed to cushion impacts, so minor noises are inevitable. However, if the sound is particularly loud, frequent, or accompanied by abnormal noises, you should be alert. It could indicate aging shock absorbers leaking oil with insufficient compression resistance; or loose suspension arm bolts causing increased collisions between components; or worn rubber bushings losing their vibration absorption function. Ignoring these issues may lead to unstable alignment, affect handling at high speeds, or even cause suspension failure. I recommend you visit a professional repair shop as soon as possible for a lift inspection and damping force measurement. Pay attention to sound changes during daily driving, and avoid rough roads to slow down wear. Safety is no small matter – early detection brings peace of mind.
I had a personal experience where the rear wheels made a 'thud' sound every time they went over a speed bump. At first, I thought it was normal vibration. But the sound grew louder, becoming unbearable even over small bumps. A friend helped me inspect it and found that the shock absorber oil had completely leaked out, and the rubber bushings on the suspension arm were cracked, causing direct metal friction. After replacing the new parts, the sound disappeared immediately, and the driving feel became much smoother. This reminded me that suspension issues should not be delayed, as minor looseness can turn into major repairs. So, I suggest you record the frequency and scenarios of the sound, such as whether it also occurs on flat roads, and inform your mechanic promptly. Don’t cut corners—small issues can accumulate into big troubles, affecting safety and making driving unpleasant.
