How to check the condition of a car's air suspension before buying: a 2025 guide

Buying a car with air suspension is a step towards comfort, but it's important to properly check the condition of the car's air suspension to avoid expensive repairs. In 2025, these systems are becoming increasingly popular in Russia, especially in premium models and SUVs. However, air suspension malfunctions can cost from 50,000 to 300,000 rubles. Therefore, it is worth paying attention to diagnostics before buying. In this article, I will tell you how to assess the condition of the system. And I will also give advice that will help you make the right decision.

What is air suspension and why does it need to be checked?

Air suspension is a suspension system that uses compressed air to adjust ride height and stiffness. It provides a smooth ride and adapts to the road. For example, SUVs with air suspension can raise the body for off-roading. However, the system is complex and expensive to repair. If the compressor, air springs or sensors are faulty, operating the car will become a problem. Therefore, checking the car's air suspension before buying is essential.

What components make up air suspension?

The system includes several key elements. Firstly, air springs—rubber cushions that support the vehicle body. Secondly, an air compressor that pumps air. There's also a valve block, height sensors and lines. If even one element is damaged, the entire system can fail. For example, an air leak from the spring will cause the car to sag. Therefore, it is important to check each component.

Why does air suspension fail?

The main causes of malfunctions are wear and tear and external factors. For example, road de-icing chemicals corrode air springs. Dirt and sand clog the compressor. Also, sensors can fail due to moisture. In Russia, where winters are harsh and roads are salted, these problems are particularly relevant. Therefore, a pre-purchase inspection of the air suspension will help avoid surprises.

How to visually check the condition of air suspension?

The first step is a visual inspection. This can be done independently, without special equipment. Firstly, look at the height of the body. If the car is standing evenly, without any tilting, this is a good sign. However, if one side has sagged, there may be a leak in the air spring. Also check how quickly the car rises after starting the engine. If the process takes more than 30 seconds, the compressor may be worn.

Air spring and line inspection

Air springs are located at each wheel. Look under the car and check them for cracks. For example, the rubber may be worn due to age. Also, inspect the lines for damage. If they are torn, air will leak out. Also, look for traces of oil or dirt. This may indicate a leak.

Compressor Operation Check

The compressor is the heart of the air suspension. To check it, listen to how it works. If you hear loud noises or vibrations after starting the engine, that's a bad sign. For example, a worn compressor may overheat. Also, pay attention to the running time. If it doesn't switch off after a minute, there may be a leak in the system.

Test drive: how to assess air suspension on the move?

Visual inspection is just the beginning. To accurately assess the condition of your car's air suspension, take it for a test drive. First, check how the car responds to bumps. If the suspension is too stiff or, conversely, too soft, this may indicate a problem. For example, worn-out air springs might not hold pressure. Also, listen for any unusual sounds. Whistling or hissing are signs of an air leak.

Height Adjustment Check

During the test drive, try changing the ride height. For example, most systems allow you to raise and lower the car. If the process takes too long or doesn't work at all, this is cause for concern. Also, check how the car handles at high speed. If the body «floats», the height sensors may be faulty.

Off-road testing

If the car is designed for off-roading, test it in those conditions. For example, drive on a dirt road or over small bumps. The air suspension should adapt to the load. If the car sags or doesn't rise, this indicates a problem. However, be careful. Do not overload the system if you already suspect a malfunction.

Equipment-based diagnostics

For accurate testing, diagnostic equipment should be used. For example, connect a scanner to the air suspension control unit. It will show errors and the system status. If you can't do this yourself, contact a service centre. By 2025, most auto service centres in Russia have equipment for air suspension diagnostics. This will cost £30–£50, but it will save you money in the future.

What errors can a scanner display?

A scanner will detect issues with sensors, the compressor, or valves. For example, a «low pressure» error indicates a leak. The scanner will also show how many times the compressor has been activated. If it's running too frequently, that means the system is losing air. Furthermore, diagnostics will identify faults in the control unit. This is important, as repairing the unit can cost up to 100,000 roubles.

How do I check the system pressure?

Air suspension pressure can be measured using a pressure gauge. To do this, it needs to be connected to the system via a special valve. Normal pressure depends on the model, but is usually 8–12 bar. If the pressure is lower, there is a leak. However, it is better to entrust this check to professionals. Incorrect connection can damage the system.

Symptoms of air suspension failure

To check the condition of a car's air suspension, it's important to know the main signs of problems. Firstly, a tilted body is a clear signal. If the car is standing unevenly, one of the struts is damaged. Secondly, slow lifting after starting the engine. This indicates compressor wear. Also pay attention to sounds. If you hear hissing, air is escaping from the system.

Long-term consequences of malfunctions

If the fault is not rectified, the problems will worsen. For example, a worn compressor may burn out. Its replacement costs from 30,000 roubles. Also, an air leak will lead to damage to other components. As a result, the repair will be more expensive. Therefore, it is important to identify the problem before purchase. Otherwise, the operation of the machine will become costly.

Which components are most prone to failure?

Air springs are the most vulnerable part. They wear out after 5–7 years. The compressor also often fails. For example, dirt and moisture reduce its service life. Height sensors also break, especially in regions with harsh climates. If the car is old, check these parts especially carefully.

Expert Tips for Buying a Car with Air Suspension

Experts recommend not rushing into a purchase. Firstly, find out the car's service history. For example, ask the seller for documents relating to repairs of the air suspension. If the system has been serviced regularly, it's a good sign. Secondly, check where the car was driven. If it was driven in regions with poor roads, the wear and tear will be higher. Also, check whether the car was used off-road.

How to negotiate with a seller?

If you've found problems with the air suspension, use that as an argument to lower the price. For example, replacing an air spring costs around £200 apiece. Point out the repair costs to the seller. However, be prepared for the seller to refuse. In that case, decide whether you're willing to take on the expenses.

Is it worth buying a car with air suspension?

Air suspension provides comfort, but requires maintenance. If you're prepared to regularly service the system, a car with it is a good choice. However, if you're on a tight budget, it's better to choose a car with standard suspension. Air suspension repairs are expensive, and not every garage will undertake them. Therefore, weigh up all the pros and cons before buying.

Air suspension technology prospects in 2025

In 2025, automakers are improving air suspension. For example, BMW and Mercedes are introducing systems with automatic diagnostics. They warn the driver about problems. Chinese brands, such as Geely, are also starting to use more reliable components. If you want to check the condition of your car's air suspension in the future, it will be easier. However, such technologies are still rare. And most buyers have to rely on their own inspection.

What innovations await us?

New technologies will make air suspension more durable. For example, in 2026, Audi plans to release cylinders with reinforced rubber. There will also be compressors with moisture protection. If these innovations become available, air suspension repairs will become cheaper. However, for the time being, such systems are expensive. And only available on premium models.

How to prepare for a future purchase?

To be prepared, keep up with the news from car manufacturers. For example, find out which models have received updated systems. Also, use modern diagnostic methods. If you're planning a purchase, choose a car with a good service history. This will reduce the risk of problems with the air suspension.

Conclusion: how to properly check the condition of a car's air suspension?

Checking the condition of a car's air suspension before buying is an important step that will save you money and hassle. Start with a visual inspection and a test drive. Then, carry out diagnostics using a scanner. Pay attention to signs of malfunctions: body lean, noises and slow lifting. If you find problems, use them as an argument for negotiation. By following these recommendations, you can make the right choice and enjoy the comfort of air suspension in 2025.