Where does the sound of air leakage come from when going over a speed bump?
2 Answers
This is the sound produced by the car's shock absorber. Here are some precautions when driving over speed bumps: 1. Reduce speed in advance: When encountering a speed bump, it is best to slow down early and then pass over the bump straight on, balancing the impact force between both tires to ensure the suspension system on both sides bears the load evenly. Avoid slamming on the brakes or accelerating, allowing the vehicle to pass over the bump naturally. This approach is both safe and protects the vehicle's suspension and steering systems, causing minimal damage to the car. 2. Pass over the bump with one side: When going straight over a speed bump, the car's jolting and bouncing will be more pronounced. However, when passing over the bump at an angle or with one wheel, the car's bouncing is reduced, and there are fewer instances of swaying when using a single wheel.
I encountered the same issue a few days ago—a hissing sound from the chassis when going over speed bumps. After a DIY inspection, I found oil stains on the right rear shock absorber. The mechanic said it was due to aging of the piston seal. That sound is actually high-pressure gas escaping through gaps in the oil seal, as the shock absorber is filled with nitrogen. If not replaced promptly, oil leakage could further compromise driving stability. My car has over 60,000 kilometers, so rubber component aging is inevitable. I recommend squatting down to check for oil sludge on the shock absorber and inspecting whether the dust cover is torn.
