What Causes the Abnormal Noise When the Car Goes Over a Bump?
2 Answers
When going over a bump, the abnormal noise heard is a metallic sound. If you fail to avoid potholes in time, the shock absorber will rapidly compress. When the compression exceeds its limit, the shock absorber will bottom out, producing a sound—this is the metallic noise from hitting the buffer block. Below are the steps to take after hearing such noise: 1. Check for Oil Leaks Under the Car: Park and inspect the vehicle. If you notice oil leaking from under the car, it may be due to a punctured oil pan. In this case, turn off the engine immediately to minimize damage. The oil pan stores the engine oil, which is essential for lubrication and cooling. Failure to address this issue promptly may lead to engine seizure or even complete failure. Then, call for a tow truck and wait for assistance. 2. Brake System and Suspension System: The brake and suspension systems should also be inspected. If severe oil leakage is observed from the shock absorber after impact, stop driving immediately. The primary reason is to prevent the shock absorber oil from contaminating the brake system, which could significantly reduce braking performance and compromise safety. For the brake system, focus on inspecting the brake caliper (also known as the brake piston), which is the closest brake component to the chassis. During inspection, check for any dripping brake fluid and test the brake pedal to see if the effective braking distance has shortened or if there are any abnormal noises. If any of these issues are present, it is advisable to arrange for a tow.
I often encounter this situation while driving. Strange noises when going over bumps are mostly related to the suspension or chassis. For example, worn shock absorbers may produce squeaking or thumping sounds, and loose control arm links can cause obvious collision noises when bumping. There may also be issues with the tires or rims. Damaged wheel hub bearings can create a humming sound, and low tire pressure can increase vibrations. Rusted exhaust pipe hangers or loose mufflers are also common causes, which can produce popping sounds. Interior parts like unsecured plastic panels can also resonate. I think these noises should not be ignored, as small problems can easily turn into big hazards. It is recommended to check for obvious looseness after parking and go to a professional shop for inspection as soon as possible. Regular chassis maintenance and tire pressure adjustments can prevent these issues. Frequent driving on bumpy roads accelerates wear, so developing a gentle driving habit is very important.
