What Causes the Car Body to Sway Left and Right When Going Over Speed Bumps?

[SanAubree]

Here are the specific reasons why the car body sways left and right when going over speed bumps: 1. Wheel Imbalance: During manufacturing, it is impossible to guarantee uniform quality for tires and rims, so wheels must undergo dynamic balancing after assembly. As tires wear over time, periodic dynamic balancing is required at certain mileage intervals. 2. Loose Suspension Components: The chassis suspension consists of various links and support arms connected through ball joints and rubber bushings. As these components wear, looseness occurs, leading to suspension looseness and body sway. 3. Excessive Steering Gear Clearance: The steering system converts the rotational motion of the steering wheel into wheel movement via a rack-and-pinion mechanism. Over time, wear between the gear and rack creates play, causing slight wheel oscillation even without steering input, which results in body sway.