How to Install Airbags on a Truck? | Air Helper Spring Setup

The term “airbags” on a truck usually refers to air helper springs—the inflatable bags that boost load capacity and level the ride—not crash airbags. For most pickup trucks and SUVs, these kits are DIY-friendly if you follow the manufacturer’s instructions carefully. The core process involves mounting the springs between the axle and frame, routing air lines, and leak-testing the system.

What Kind of Airbags Are You Installing?

Rear air helper springs are the most common aftermarket setup on pickups. They mount between the rear axle and the frame, using air pressure to support loads that would otherwise squat the suspension. The installation steps below apply to these helper spring kits on pickups, SUVs, and some light trucks.

Crash airbags are an entirely different system with federal labeling requirements for medium and heavy trucks, per NHTSA. The process here is for load-supporting air springs.

Step-by-Step Airbag Installation Process

Every kit varies, but the documented procedure for Firestone air helper springs follows a consistent order. Always refer to your kit’s manual for model-specific details.

1. Prepare the truck: Park on a solid, level surface and chock the wheels.
2. Raise and support: Jack up the truck and support it on jack stands rated for the vehicle’s weight. Disconnect the negative battery cable where the instructions call for it.
3. Remove wheels: Take off the rear wheels if needed to reach the suspension components.
4. Preassemble the air springs: Attach the upper and lower brackets and fittings to the air spring before mounting.
5. Install the bracket assembly: Secure the assembly to the axle and frame per the kit instructions. Some kits require removing or relocating jounce bumpers; others may need a heat shield near the exhaust.
6. Route air lines: Run the tubing carefully, cutting it square and avoiding sharp bends, kinks, heat sources, moving parts, and brake lines.
7. Mount inflation valves: Place them in an accessible, protected location.
8. Inflate and leak-test: Inflate the bags and check all fittings with soap solution.
9. Reinstall wheels and verify: Lower the truck and confirm clearance around the bags and nearby components.

The most common installation mistake is poor air line routing. A kinked or pinched line fails under load, so take time to plan the path from the bag to the valve.

Clearance and Safety Rules That Matter

Air springs need room to work. The bags should sit as vertical as possible with the upper and lower brackets generally parallel to each other.

If the system will support towing or heavy loads, adjust air pressure only within the kit’s stated limits. Excessive pressure can reduce clearance or damage the bags over time.

Compatibility and Getting the Right Kit

Airbag kits are not universal. Bracket placement, clearance, and air line routing vary by kit and truck platform. The correct kit must match your truck’s model, year, and trim level—including suspension type and whether you have leaf springs or coil springs. Firestone’s official guidance says to follow the installation manual for kit-specific procedures and maintain proper design height.

Before buying, check what your truck needs. Some kits require removing jounce bumpers; others need heat shields on the exhaust side. If you are shopping for a system, our tested roundup of truck trailer air bags worth buying covers the best options for different loads. Firestone’s installation guidance on their official installation page is the reference for kit-specific steps.