Regular servicing is essential for every vehicle, whether it is a bicycle, a car or a motorhome. Consistent maintenance helps prevent major structural damage and costly emergency repairs.
Like other vehicles, motorhomes are subject to periodic roadworthiness inspections. Depending on the vehicle weight category and the rules in the country of registration, this inspection is generally required at regular intervals and should include a thorough check of the air-suspension system. In response to frequently asked customer questions, Towbars-online has compiled the key advice from its technical specialists below.
What is air suspension?
For many motorhomes, adding auxiliary suspension to the rear axle has become a widely used solution. The system uses air bellows to support the original suspension, improving driving comfort, stability and load distribution.
The most common issues
Most failures are caused by an air leak or a loss of pressure. The main causes are:
- Ageing: After 6 to 8 years, air bellows can become porous due to material fatigue and exposure to weather conditions.
- Incorrect installation: Installation errors, such as overtightened threaded fittings or air lines that are not properly protected from heat and vibration, can cause damage.
- Incorrect use: The system must always operate within the correct pressure range, typically between 1 bar and 7 bar.
- Note: The optimum pressure for a loaded vehicle of 3 to 4 tonnes is usually between 3 and 3.5 bar.
- Mechanical damage: Stone chips, road salt and aggressive chemical products can damage the bellows.
- Electromechanical faults: These are less common and may involve the valves, compressor or control units.
How to identify a fault
Several signs can help you identify a fault without specialist equipment:
- Visual inspection: If the rear of the vehicle is sagging or leaning to one side, the suspension is likely to be faulty.
- Inflation frequency: One or two top-ups per year are normal. If the compressor starts more often, there is probably a leak.
- Pressure-gauge vibration: A needle that vibrates while the system is being pressurised indicates a significant leak.
Tip for locating a leak: Spray soapy water or a leak-detection spray onto the fittings and air lines. Air bubbles will confirm the exact location of the problem.
Repairs and annual maintenance
Air suspension does not require regular lubrication, but an annual check is recommended to ensure long service life:
- Annual inspection: Inspect the bellows for cracks or porous areas, check the fittings, and look for any signs of corrosion.
- Cleaning: After winter, rinse the system thoroughly with water to remove road salt. Annual cleaning with soapy water is sufficient.
Costs and parts: Repairs may range from replacing a simple air line to replacing the compressor or the air bellows.
You can find many spare parts at X-camping.eu.