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What Causes the Hissing Sound When a Car Goes Over a Speed Bump?

1 Answers

McAdriana

07/30/25 12:25am

Car makes a hissing sound when going over a speed bump due to the working principle of the shock absorber itself. When the vehicle passes over a bumpy road, the entire shock absorber is compressed, thereby compressing the external spring. However, after the vehicle passes the bumpy section, the spring's elasticity will reset the shock absorber. During this compression and resetting process of the shock absorber, a hissing sound is produced. Introduction to the Shock Absorber's Functioning Process When Going Over a Speed Bump: The most common type of shock absorber in household cars is the twin-tube shock absorber. What is visible externally is the outer tube of the shock absorber, inside which there is a set of piston and piston tube structure. The piston has valves, and the space between the piston, piston tube, and outer tube is filled with shock absorber oil. When the shock absorber is compressed, the piston squeezes the shock absorber oil, with some of the oil flowing through the valves into the upper part of the piston, and another part flowing into the outer tube of the shock absorber. When the shock absorber resets, the piston moves upward, and the shock absorber oil in the outer tube replenishes the piston tube. Simultaneously, the shock absorber oil in the upper part of the piston moves downward. The damping force is generated through the obstruction effect of the shock absorber oil, dissipating the impact force. Therefore, when the shock absorber is compressed or reset, the internal shock absorber oil flows rapidly, producing a hissing sound. Precautions When Going Over a Speed Bump: When encountering a speed bump while driving, reduce the speed early and then pass over the speed bump straight, balancing the impact force on both tires to ensure the suspension system on both sides bears the force evenly. Do not slam on the brakes or press the accelerator, allowing the vehicle to pass over the speed bump purely by inertia. This approach is both safe and protective of the vehicle's suspension and steering systems, causing minimal damage to the car.

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