What are the causes of air suspension failure?
2 Answers
Introduction to the causes of air suspension system failure: 1. Airbag aging: Generally, after 3-5 years of use, the airbag is almost aged and needs to be replaced; 2. Shock absorber core oil leakage: Since the shock absorber core is the key part of the suspension, if it leaks oil, the repair value is much lower; 3. Problems with the distribution valve or shock absorber air pump. Below is relevant information about air suspension: 1. Introduction: Air suspension generally refers to the air suspension system. Typically, vehicles equipped with air-adjustable suspension have ground clearance sensors near the front and rear wheels. Based on the output signals from these sensors, the vehicle's computer determines changes in body height and then controls the air compressor and exhaust valves to automatically compress or extend the springs, thereby lowering or raising the chassis ground clearance to enhance high-speed stability or off-road capability. 2. Variable stiffness of air suspension: Variable stiffness refers to the characteristic of air springs compared to leaf springs or coil springs. Using a height valve as the basis, air springs have stiffness that varies with load. A direct experience is that when riding in a truck with leaf springs when it's unloaded, it feels like the vehicle bounces on the road at a high frequency. With air springs, whether loaded or unloaded, the ride feels almost the same.
Air suspension failures can stem from several common root causes. Airbag leaks are the primary culprit, where aging rubber materials or physical damage cause slow or rapid air loss, preventing the vehicle from maintaining proper ride height. Air pump malfunctions are also prevalent - if the compressor fails, it can't supply adequate air pressure, often due to motor wear or thermal protection triggers. Sensor issues like contaminated or faulty height sensors may send incorrect data to the control module, causing misguided adjustment attempts. Control module failures themselves, whether from circuit board damage or software bugs, can crash the entire system. Additionally, loose pipe connections, stuck valves, or desiccant failures may indirectly cause pressure instability. Having repaired many such cases, I've observed that unresolved faults compromise handling balance, accelerate uneven tire wear, and pose significant chassis damage risks. Recommended first steps include inspecting airbag conditions and listening for pump operation sounds, though consulting professional technicians with diagnostic tools for error code reading remains the wisest approach for targeted repairs.