Troubleshooting Suspension Install header.

Troubleshooting a Suspension Install That Didn’t Go as Planned

Written by: Nicki B.

Last Updated:10/09/2025

So you installed an air bag suspension kit… but something feels off?

Don’t panic. You’re not the first neighbor to finish an install and realize the ride isn’t quite right. Maybe the truck still sags, maybe one bag won’t inflate, or maybe you’re chasing down a slow leak. The good news? Most of these problems are common and simple to fix once you know what to look for.

At etrailer, we’ve seen just about every kind of post-install “what did I do wrong?” moment you can imagine. (Trust me — I’ve had a few of those driveway diagnostics myself.) The good news? Most issues boil down to simple things: a loose line, uneven pressure, or a bracket that needs a quick tweak.

Here’s the breakdown of the most common air bag install problems, and what to do before you grab a wrench in frustration.

Problems in this article:

Before You Start: Give It a Once-Over
One Bag Won’t Inflate
Truck Sits Uneven After Install
Pressure Drops Overnight
Compressor Doesn’t Turn On (If Equipped)
Bags Fold or Rub on Brackets
Other Common Fixes to Try

Before You Start: Give It a Once-Over

Before diving into any single problem, take five minutes for a quick visual check. You’ll save yourself a lot of chasing your tail later.

Start here:

Make sure your air lines aren’t touching anything hot or sharp.
Verify every fitting is fully seated — you should feel a solid “click” when it’s in.
Check that both bags have at least 5 PSI (never run them completely empty).
Look for any signs of rubbing or twisted brackets.

If everything looks right and the truck still isn’t behaving, you’re in the right place. Let’s troubleshoot.

Problem: One Bag Won’t Inflate

Why won’t one of my air bags hold air?

Usually it’s not the bag — it’s the connection.

We see this one all the time. You install the kit, air up the system, and one side stubbornly stays flat. The instinct is to blame the bag, but it’s almost always the fitting or air line instead.

Likely causes:

Loose or poorly seated air line fitting
Kinked or crushed air line
Faulty T-fitting or valve connection

How to fix it:

Start right at the bag. Make sure the line’s cut perfectly straight, not angled, not squished. A sloppy cut is the #1 cause of slow leaks and bad seals. If it looks rough, snip a clean end and reinsert it until it seats firmly.

Still no luck? Swap the lines side to side. If the issue moves with the line, congratulations, your bag is fine. The problem’s in the connection or T-fitting.

Problem: Truck Sits Uneven After Install

Why is my truck leaning after installing air bags?

Because one side’s carrying more weight — or more air.

If you walk around your truck and notice one fender sitting a little low, you’re not seeing things. It’s one of the most common complaints after an install. Usually, it’s not the hardware, it’s the setup.

Likely causes:

Uneven air pressure (dual-path systems are especially sensitive to this)
One bag over- or under-filled
One side of the truck loaded heavier

How to fix it:

Grab a tape measure and check your fender-to-ground height on both sides (yes, it’s worth doing even if you “eyeballed it”). Inflate or deflate one side until you’re level. If you can’t get it even no matter what, it might be time for a dual-path system, they let you fine-tune each side independently instead of sharing pressure.

If you’re hauling something heavy — like a camper or a loaded toolbox — double-check how it’s distributed. Even a few inches of difference in tongue weight can make one side sag.

Problem: Pressure Drops Overnight

Why do my air bags lose air when parked?

Sometimes it’s a leak, sometimes it’s just physics.

Here’s the thing: a few PSI of loss overnight isn’t always a problem. Air compresses and expands with temperature, so if it’s 80° during the day and 50° at night, you’ll see a small dip in pressure by morning. That’s totally normal.

Likely causes:

Tiny leak at a fitting
Air line not fully seated
Temperature swing (3–5 PSI loss is fine)

How to fix it:

Mix up some dish soap and water, spray every fitting, and watch closely. If bubbles form (even slowly), that’s your culprit. Deflate the bag, cut the line square, and reinsert it firmly.

If you only see minor pressure loss on chilly nights, relax — it’s not a leak, it’s just physics doing its thing.

Problem: Compressor Doesn’t Turn On (If Equipped)

Why isn’t my onboard compressor running?

Before you assume the whole system’s dead, start simple.

A compressor that won’t turn on can feel like a full stop, but most of the time it’s something small — a fuse, a ground wire, or a sleepy Bluetooth connection.

Likely causes:

Blown fuse or disconnected ground
Faulty pressure sensor or switch
App not synced or Bluetooth turned off

How to fix it:

Pop open the fuse box and check your connections. Make sure your compressor has power at the plug. If it doesn’t, trace the wiring back — the issue’s usually right there.

For wireless systems, open the app and make sure your phone’s Bluetooth is on and synced. (We’ve all spent 10 minutes troubleshooting before realizing it wasn’t connected.) If your kit has a physical controller, try that too.

Quick test: Manually inflate the bags using an air compressor. If they hold pressure fine, your onboard system is the issue — not the bags.

Problem: Bags Fold or Rub on Brackets

Why do my air bags look twisted or folded?

Because they’re underinflated or mounted off-center.

Air bags aren’t meant to run empty — even when you’re not towing. When they deflate completely, they can fold or pinch between the brackets, which causes rubbing, wear, and eventually small leaks.

Likely causes:

Bags installed with little or no air
Brackets misaligned

How to fix it:

Deflate the system and inspect the bracket alignment. Compare it to the install manual — sometimes the bracket orientation is easy to miss. Once everything’s straight, reinflate and always keep at least 5 PSI in the bags, even unloaded.

Pro tip: If you hear squeaking or rubbing noises, don’t ignore them — that’s your early warning sign.

Deflated air bag installed.

Other Common Fixes to Try

Still having issues? Here are some quick checks that solve 90% of mystery problems:

Truck still squatting? You may just be over your GVWR (Gross Vehicle Weight Rating). No suspension upgrade can safely fix that — it’s time to lighten the load.
Air line too close to heat? Reposition it or add a heat shield before it melts through.
Compressor noisy or slow? Mount it on rubber isolators, and make sure it’s got good airflow.

If you’re still frustrated, walk away for 10 minutes. Seriously. A quick break does wonders for both patience and problem-solving.

Still Stuck? Here’s What to Have Ready When You Call etrailer

If you’ve checked the basics and you’re still scratching your head, give us a call. Our team talks neighbors through this stuff every day. To save time, have this info handy:

Truck year/make/model and suspension kit part number
What’s happening (and what you’ve already tried)
Photos of your install — especially air line routing and fittings
PSI readings, and whether you’re running single or dual path

The more details you can share, the faster we can get you rolling again.

Wrap-Up: Most Problems Are Easy Fixes

Air bag installs look complicated, but most issues come down to three things: leaks, alignment, or routing. Once you know where to look, the fixes are straightforward — and you almost never have to uninstall a thing.

A little patience (and a bottle of soapy water) goes a long way. Once your setup’s dialed in, your truck will sit level, tow smoother, and handle loads like it should.

Bottom line: don’t panic. Check the simple stuff first, trust your gut, and remember — even the most seasoned installers had to chase their first air leak once. You’ve got this.

Nicki Sitting on picinic table in front of rv.

About Nicki B.

I’ve always loved learning and teaching. Every day I get the chance to help a neighbor pick up something new, whether it’s understanding how to tow with more confidence, setting up camp a little easier, or just finding the right gear for their next trip. For me, the real joy comes from turning those little “aha” moments into solutions that make life safer, smoother, and more fun.

Outside of work, you’ll usually find me outdoors. I love fishing, camping, and hiking the trails with my family and our golden retriever (who insists on carrying the biggest stick he can find). I spent years as a Cubmaster and scout leader, and now I get to put those skills to good use running our team campouts. My favorite part is dreaming up fun games and activities that get everyone laughing.

When I’m not outside, I’m probably curled up with a book or unwinding with some old Top Gear reruns. At the end of the day, I just like finding ways to make things a little easier and more enjoyable, on the road, at camp, or at home.