Everything To Know About Airbag Suspension PSI
Author: Toby Date Posted:17 April 2025
Getting your airbag suspension dialled in properly isn't just about comfort. It's about control, safety, and keeping your vehicle level no matter what you're carrying. From tradie utes to touring rigs, more Aussie drivers are turning to air suspension for its flexibility and load-handling benefits.
It isn't just a 4WD thing either. Luxury brands like Mercedes-Benz, BMW, and Audi use air suspension in their high-end models to provide adjustable ride height and a smoother driving experience.
In this guide, we’ll cover how to set your airbag pressure for different conditions, common pitfalls to avoid, and give you a handy PSI chart to make adjustments easy.
Key Takeaways
- Correct airbag suspension PSI improves performance: Proper pressure enhances ride comfort, handling, safety, and load-carrying support.
- There is no universal PSI setting: The ideal pressure depends on your vehicle, payload, towing setup, and road conditions.
- Avoid incorrect air pressure: Running airbags with too much or too little PSI can reduce handling, increase tyre wear, and place unnecessary stress on the suspension.
- Check pressure regularly: Inspect and adjust airbag PSI before towing, carrying heavy loads, or setting off on long-distance trips.
- Keep your vehicle level: Properly adjusted airbags help maintain ride height and stable handling across a wide range of driving conditions.
What Is an Airbag Suspension?
Airbag suspension swaps out your coil or leaf springs with inflatable airbags (or air springs). They’re great for 4WDs, utes carrying tradie gear, performance builds, and even towing caravans. With adjustable pressure, you can tailor your suspension for a smoother ride or improved clearance without needing any tools.
Why Airbag Suspension PSI Actually Matters
If you’ve got airbags fitted, knowing the right PSI (pounds per square inch) isn’t something you can just guess and hope for the best. The pressure you run directly impacts how your vehicle handles weight, whether it’s tools in the back, a trailer on the towball, or a full load of camping gear.
Too much pressure creates a stiff, bouncy ride, which isn't ideal for comfort or control. Too little, and you risk sagging suspension, poor handling, and uneven tyre wear. Over time, that kind of strain can even damage your vehicle’s frame or suspension mounts.
- Keep your vehicle level under load
- Improve safety and braking performance
- Protect your gear and passengers
- Extend the life of your suspension setup
In short: knowing your airbag suspension PSI is essential if you want to get the most out of your investment.
What PSI Should Your Airbag Suspension Be?
There’s no one-size-fits-all number when it comes to airbag suspension pressure. The ideal PSI depends on a few key factors that can vary every time you drive:
Vehicle Weight
The heavier the vehicle, the more air pressure you’ll need to keep it level and supported. A stock sedan or lightly loaded 4WD might only need around 5-10 PSI, while a dual-cab ute with a steel canopy and bullbar could require 10-25 PSI, even when it’s not fully loaded.
Loaded Up or Running Light
If your vehicle is carrying extra weight, such as tools, cargo, camping gear, or passengers, you'll need to increase the PSI to maintain the correct ride height and handling.
- A light load like daily tools or a couple of passengers might call for 10-25 PSI
- A medium load of 300-600 kg (like a full touring setup) would need 25-40 PSI
When you’re driving with an empty tray or cabin, you can safely drop the pressure down to 5-10 PSI for a smoother ride.
Road Conditions
Smooth highways generally allow lower airbag pressures, especially when the vehicle isn't heavily loaded. Around 5 to 15 PSI is often suitable. If you're driving on gravel roads, corrugations, or rough off-road tracks, increasing the pressure to around 25 to 40 PSI or higher can improve stability and reduce body roll. Some drivers also increase pressure slightly when extra ground clearance is required.
Towing or Carrying Gear in the Tray
Towing places additional weight on the rear axle and changes your vehicle's balance. For medium to heavy trailers or caravans, you'll commonly need between 40 and 70 PSI to help maintain a level stance and reduce trailer sway. If you're approaching your vehicle's maximum towing or payload capacity, pressures of up to 70 to 100 PSI may be necessary. Always check your airbag manufacturer's recommended pressure limits and your vehicle's axle load ratings before making adjustments.
Here’s a rough guide:
Airbag Suspension PSI Chart
| Load Condition | Front Axle Load (kg) | Rear Axle Load (kg) | Required PSI |
|---|---|---|---|
| Empty / No Load | 800-1,000 | 600-800 | 5-10 PSI |
| Light Load (daily driving) | 900-1,100 | 800–1,100 | 10-25 PSI |
| Medium Load | 900-1,100 | 1,100–1,400 | 25-40 PSI |
| Heavy Load / Towing | 950-1,150 | 1,400–1,800 | 40-70 PSI |
| Maximum Load | 1,000-1,200 | 1,800–2,200+ | 70-100 PSI (check limits) |
Tip: Always check your airbag manufacturer’s specs. Running too low can cause the bag to rub or fold. Too high? You’ll get a stiff ride and uneven tyre wear.
How Often Should You Check Your PSI?
If you regularly use your airbags for towing or carrying heavy loads, it's worth checking the pressure every week. If they're only used occasionally, checking before each major trip is usually sufficient.
Keep in mind that air pressure can fluctuate with changes in temperature, just like your tyres.
Signs Your Airbag PSI Might Be Off
You might notice:
- One side of the car sitting lower
- Bouncy or stiff ride quality
- Poor handling or sagging rear end
If your vehicle feels off, check your PSI before assuming there’s a mechanical issue.
Need Help Choosing Airbag Kits?
At Superspares, we stock airbag suspension kits and accessories for a wide range of vehicles, whether you're towing, touring, or simply looking for a more comfortable ride. As a trusted auto parts store, we also offer suspension upgrades that can further improve ride stability and performance. If you’re not sure what kit suits your car or how to dial in your setup, get in touch with our team or explore our online range.
Written by Toby Martin
Automotive Content Specialist
FAQs
What is the recommended PSI for airbag suspension? +
There isn't a single recommended PSI for every vehicle. The correct pressure depends on your vehicle's weight, how much load you're carrying, road conditions, and whether you're towing. Always follow your airbag manufacturer's recommended pressure range.
Can you drive with low airbag suspension PSI? +
You can, provided you maintain the minimum pressure recommended by the manufacturer. Running the airbags below the minimum PSI can cause them to fold or rub, leading to premature wear or damage.
What happens if your airbag suspension PSI is too high? +
Excessive air pressure can make the ride feel harsh and bouncy, reduce ride comfort, and contribute to uneven tyre wear. It may also affect how the suspension responds to bumps and uneven road surfaces.
How often should you check your airbag suspension pressure? +
If you regularly tow or carry heavy loads, check your airbag pressure weekly. For occasional use, it's a good idea to check it before long trips or whenever your vehicle's load changes significantly.
Does towing require higher airbag suspension PSI? +
Yes. Towing adds weight to the rear axle, so you'll generally need to increase the PSI to keep the vehicle level, improve stability, and reduce trailer sway. The exact pressure depends on the trailer weight and your vehicle setup.
Does airbag suspension PSI change with temperature? +
Yes. Like tyres, airbag pressure can rise or fall as temperatures change. It's worth checking the PSI during significant seasonal changes or before long trips to ensure the suspension is set correctly.
How do I know if my airbag suspension PSI is incorrect? +
Common signs include a sagging rear end, one side of the vehicle sitting lower than the other, poor handling, or a ride that's either too stiff or overly bouncy. Checking the airbag pressure should be one of the first troubleshooting steps.
