What Causes the Squeaking Sound When Driving Over Speed Bumps with a Cold Chassis?
2 Answers
The reasons for the squeaking sound when driving over speed bumps with a cold chassis are as follows: 1. The shock absorber rubber pads are too cold and lose elasticity. 2. Aging of the lower control arm bushings and stabilizer link bushings. 3. The bushings at both ends of the shock absorber are made of materials like polyurethane or hard rubber, which harden when cold and expand or contract with temperature changes, creating gaps that cause friction noise. Solutions are as follows: 1. Timely repair of the shock absorber system. 2. It is recommended to check the lubrication of the components. If the lubrication is poor, it is advisable to replace them directly. 3. The issue might be caused by oil leakage or bending of the shock absorber itself. Such components cannot be repaired directly; they should be replaced if problems arise.
My car makes squeaking noises from the chassis when going over speed bumps after cold starts in winter, which had me worried for a while. After some tinkering and research, I found that it's mainly due to aging rubber bushings in the suspension system. In cold weather, rubber becomes stiff and brittle, and when the chassis is subjected to impacts like speed bumps, it rubs against the chassis structure, producing harsh sounds. Common failure points include the shock absorber buffer rubber blocks, bushings at the stabilizer bar connections, or suspension linkage ball joints. These parts tend to loosen or run out of lubrication over time. I recommend inspecting these components, and if you notice cracks or wear, they should be replaced. If you're doing it yourself, you can buy a kit, but it's safer and easier to have a professional mechanic handle it. Regular maintenance with some lubricant can also help alleviate the issue. Ignoring it could turn a minor problem into a suspension failure, affecting driving control, so timely action is important.
