What Causes Noise from the Car Chassis?
2 Answers
The reasons for noise from the car chassis: 1. Problem with the stabilizer bar bushings: The symptom is that the chassis makes abnormal noises when the vehicle passes over uneven roads. Due to erosion by mud and dust, the stabilizer bar bushings become harder as they age, causing inconsistent heights between the left and right wheels and resulting in noise. 2. Problem with the brake pads: The symptom is abnormal noise from the front wheels, especially noticeable when turning the steering wheel. If the noise stops when the brakes are applied, it can generally be confirmed that the brake pads are the issue. 3. Problem with the connection between the suspension and shock absorber: If the chassis makes a creaking noise while driving, this is likely the cause. The diagnostic method is to turn off the engine, press hard on the upper part of the vehicle's suspension to make the body sway up and down, and listen carefully for the noise to identify the problematic part. 4. Other causes include abnormal noise from the wheel bearings, deformation of the shock absorber springs, aging or abnormal wear of the shock absorber pressure bearings, etc., all of which can lead to abnormal noises from the car chassis.
I remember once when I was driving on a long-distance trip, there was always a thumping sound from the chassis, especially noticeable when going over bumpy roads. I thought it might be an issue with the suspension system, such as a broken shock absorber or loose spring mount. Additionally, worn brake components or aging wheel bearings can also cause similar noises. That time, I asked a roadside mechanic to check, and it turned out the rear axle rubber bushing was cracked. After replacing it, the noise immediately disappeared. Chassis noises should not be taken lightly, as they could indicate problems with the vehicle's frame, such as loose screws or a broken rusty exhaust pipe, all of which affect safety. I recommend slowing down and stopping as soon as you hear any noise, then finding a safe place to briefly inspect the underside. If unsure, go directly to a professional shop for a check-up—don’t delay like I did until it got worse. Regular maintenance of the vehicle's suspension is also crucial to avoid unnecessary repair costs.
