Is Modifying Suspension Considered Illegal Vehicle Modification?
2 Answers
Modifying a vehicle with air suspension is considered illegal modification. Any vehicle modifications that have not been filed and registered with the vehicle management department are deemed illegal. Vehicles with illegal modifications cannot pass annual inspections and must be rectified before retesting. Here is an introduction about vehicle suspension: The working principle of air suspension involves controlling air pressure to adjust the vehicle's height. It consists of elastic rubber airbag shock absorbers, a pneumatic control system, an electronic control system, etc. Air suspension is a relatively precise automotive component. Unlike factory-installed shock absorbers, air suspension features an elastic rubber airbag that can be filled with inert gas or an oil-gas mixture in a sealed pressure cylinder to increase internal pressure and enable piston movement. However, air suspension is not suitable for driving on complex roads as it may lead to unstable air pressure or slow air leaks. Vehicles equipped with air suspension are more suitable for urban slow driving or gatherings and cannot withstand severe bumps.
Ever since I got into cars, I've loved modifying suspensions—the thrill of improved handling is just unbeatable, but you've got to watch out for legal boundaries. In China, traffic laws prohibit unauthorized alterations to a vehicle's structure. Suspension mods aren't outright illegal as long as they don't change the original ride height or stiffness, like swapping in performance springs to adjust firmness—certified parts are fine. But if you lower or raise the car, compromising stability, you're in for trouble during traffic stops or annual inspections, risking fines or even being barred from driving. I once upgraded my rear suspension—looked slick but landed me a fine. Now I stick to reputable brands and keep receipts handy just in case. Bottom line: suspension tweaks impact safety, so don’t just chase the cool factor—check local regulations first. Safety always comes before everything else.
