For safety and stability, air springs are the perfect partner for your rear suspension when you are hauling heavy loads. Springs fit inside existing coil springs to help level your vehicle, improve braking and handling, and reduce tire wear. Great Prices for the best vehicle suspension from Firestone. Firestone Coil-Rite Air Helper Springs - Rear Axle part number F4182 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
All Info
Reviews (780)
Q & A (0)
Related Parts
Photos
Firestone Vehicle Suspension
- F4182
Highlights
Custom Fit for Your Vehicle: Mounts to existing attachment points
1,000-lb Load Support: Keeps your vehicle level under heavy loads for safer handling and braking.
Better Steering Control: Balances weight to maintain traction and headlight aim when loaded.
Smooth, Stable Ride: Absorbs road shock and prevents bottoming out for comfort on rough roads.
Adjustable 5–35 psi Air Pressure: Lets you fine-tune height or side-to-side balance for uneven loads.
Durable Polyurethane Design: Long-lasting construction stays elastic for consistent support.
Features to know about
Keep the Rear End Level and Handling Sharp: Load-Leveling Support up to 1,000 lbs
Heavy cargo or a trailer can make the rear of your ride sag, throwing off steering and braking. The Firestone Coil-Rite Air Helper Springs fit inside your existing rear coil springs and add load-leveling support for at least 500 lbs and at most 1,000 lbs. By maintaining even load distribution with adjustable air pressure from 5 psi to 35 psi, they help keep your vehicle level, improve braking response, and reduce tire wear under load.
Smooth Out the Ride and Prevent Bottoming Out: Adjustable Air Pressure
Road shock and body roll can wear you out when hauling or carrying weight that’s off center. Each Coil-Rite spring has its own manual inflation valve so you can adjust air pressure side to side for balanced support. Fine-tuning the pressure softens contact between the axle and frame, prevents bottoming out, and makes for a smoother ride whether you’re loaded down or running light.
Built to Handle Real Work: Durable Polyurethane Construction
These springs don’t just help with load support—they’re made to last through heavy use and tough roads. Firestone builds each Coil-Rite spring from elastic polyurethane that holds shape and flexibility over years of service. The material resists fatigue during hard work and temperature swings while staying leak-free when properly installed.
Straightforward Install for DIYers: All Hardware Included
Installing extra suspension support doesn’t need to be a shop job. The kit comes with the brackets, air springs, hardware, air line, and separate valves needed for manual inflation. You route the air lines to your bumper for easy access to the Schrader valves. Compressors, tanks, or in-cab switches are optional add-ons if you want faster adjustment later on. Once installed inside your coil springs, the system quietly enhances stability every time you hit the road with a load.
Specs
Weight and Capacity
Load-leveling capacity: at least 500 lbs (at most 1,000 lbs)
Coil-Rite springs will not increase your vehicle's weight-carrying capacity. Do not exceed the manufacturer's recommended weight limit.
Air Pressure
Adjustable air pressure: 5 psi to 35 psi
Warranty
Limited lifetime warranty on air springs
2-Year limited warranty on hardware
Note
The construction material of the fittings may vary.
WARNING: This product and/or related accessories can expose you to chemicals including lead and/or lead components, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.p65warnings.ca.gov.
Customers Who Purchased This Vehicle Suspension Also Bought...
The Air Helpers are a real bear to install, took me 5 hours and lots of ingenuity but it's done now.. They are a very dense, thick, flexible material that are extremely stiff and don't go easily (a huge understatement) between the coils to lodge inside the springs. They are quite low volume so be careful to inflate small amounts at at time until you reach the desired pressure. Haven't had them under a load yet, but if you manage to get them in place I expect they will provide stiffening as advertised. 1013754
Led
4/17/2022
Not really helping, and theres a slow leak in one of the systems.
by:
EAR
08/13/2015
2008
Mitsubishi
Outlander
Product does what it says it will do for my 2008 Mitsubishi Outlander. Had a leak in one of the bags but Jean at etrailer.com got me connected directly with Fire Stone. They got a replacement out to me ASAP. Very happy customer TY The picture shows the extra weight I have on my SUV. 219000
by:
Jeremy C
08/16/2020
Installation was easy, and the system has been completely problem free after a year of use. 863122
by:
Gabriel
08/12/2020
2012
Mitsubishi
Outlander
Good product ! It help a lot for towing heavier loads. Installation was a bit hard to do on my Outlander 2012. 860457
by:
Matt
09/28/2017
2008
Mitsubishi
Outlander
Made a big difference while towing with our 2008 Mitsubishi Outlander. 437205
by:
Jean -
04/15/2020
Mitsubishi
Outlander
excellent product, improved the capacity of my mitsubishi outlander, 779177
by:
Pierre
09/11/2022
Good product. Kit is complete. Doesn't resist well to potholes. Not so easy to install. Even more difficult to remove and replace. A good challenge for a week-end mecanic. 1402804
by:
Francesca
09/25/2020
2007
Mitsubishi
Outlander
Tremendous help when towing.892554
by:
John
06/04/2019
2015
Lincoln
MKC
arrived as promised653344
by:
Stanley
07/03/2025
Well I did not expect to have a one year follow up from ETrailer! I’m a 5 Star happy with these airbags over the AirLift 1000’s I had that blew out just after the warranty was up! These bags are more than twice the product, as you can inflate to >60 psi and that makes for a way more steady ride with weight! I typically run mine at around 45 psi now, the AirLift are limited to 28 psi. The construction is far superior and quality is excellent!!! 3363598
Really cool to hear how well the airbags have been working out for you, especially hearing your experience in the past. How's the ride day-to-day when you're not hauling that awesome camper?
Stanley
7/4/2026
Other than a slight leak in the driver’s side that is not any fault of the product, this set up has worked extremely well! I’m very happy with these air bags and would highly recommend them over the AirLift1000 bags as there’s no comparison in quality! These Ride Rite bags are worth every penny!!!
by:
Dustin
07/29/2026
I initially ordered the wrong airbags. I called eTrailer and Jeremy H. was very understanding. He got the right ones immediately shipped out and sent me a return label and info while I was on the phone with him. The bags seem good quality comparable to my previous Airlift bags. Instructions were well written and all hardware was accounted for in the shipment. 3597290
Thank you so much for taking the time to leave a review and for sharing those awesome photos! I'm really glad Jeremy was able to get everything straightened out quickly and make the exchange process easy. How are the bags working for you so far?
by:
Joel
01/19/2026
Chevrolet
Avalanche
Phone service was excellent. Air bags helped a lot with stability. I found it easier to remove the spring from the Avalanche than to fight with it in chassis. Removing the spring also gave me a chance to clean the dirt and rocks out of the hose routing area. It was a little more work to drop the axle down but it really wasn't that bad. I was able to do it all without a hoist. Just used two floor jacks. I just let one side down at a time. Remove your swaybar link and shock and let one side down. Pull the spring and do the work in a vise. Its much easier than fighting with it on your back. Also put the air hose in really hot water and it will relax its memory. 3479570
Good idea taking the springs off, Joel! These can definitely be a bit of a pain in the butt with all the stuff impeding an easy install. Being able to clean the area is also nice!
What are you towing with your Avalanche? Or did you want these more for regular driving?
by:
Randall
08/26/2026
2022
Ram
1500
Great Idea - but they won’t hold air, which makes them useless! I knew they would be difficult to install, so I had an experienced auto mechanic who has installed these before to help me. They went in nicely, there were no leaks at the fittings-but they just refuse to hold air. Very disappointing. 3615255
Mike L.
8/26/2026
Have you tried putting a dishwashing liquid/water combo on the area where the air line joins with the bag? This will make any leaks stand out like a sore thumb. It's extremely important that the air lines are cut precisely at a 90° angle. You can't use angle cutters, because it will crush the air line and it'll always leak....
Randall
9/4/2026
@MikeL
Yes we did the soap/water thing with no obvious leaks and we were very careful about how we cut the air line.
I got underneath the truck again and redid the soap/water spray without any obvious signs of a leak! I tightened all the fittings a little more and topped off the air — waited overnight and checked again —— still leaking, but maybe not as bad. In any case, to keep the minimum pressure I’ll have to ad air every morning before I can go anywhere! Not very convenient.
by:
Tom
07/13/2026
Installer couldn't get them to hold air for more than a day. And if pressure falls below 5 psi, there's a risk of damaging them. Installation was difficult. But they do fix the ride height issue when towing. If I had it to do over, I'd get Sumo springs. 3584046
Mike L.
7/14/2026
I'd make sure that the tubing that goes into the air spring's fittings are cut so they're perfectly square. That is the main culprit when it comes to leaks....
by:
Ethan
06/23/2025
I bought this set because I was having problems with one of the airbags I previously had gotten. It was on the right side of my forerunner. It had a slow leak. When I replaced the airbag this time it had a very fast leak. I finally found That if I used NAPA Sil-Glyde to insert tube it seems to be holding air. And I squeezed air bag into the spring. Use soap for sliding it in. 3355009
Ethan
6/25/2026
I had to take the right rear airbag and deflated it. I took a piece of mudflap about a quarter inch thick and put it on top of the airbag with a hole in the middle of the mudflap piece that gave more clearance between the car and the airbag valve. Now I have had no leaks for a year. With the least 9000 miles of towing and rough terrain.
by:
Jeffery
07/16/2025
These bags along with minor adjustments to my load leveling hitch made towing my 19.4 No Bo trailer so much more relaxing!I am running 20 PSI and 3/4 of an inch higher than stock ride hight. Easy peasy 3372411
That's an awesome shot, Jefferey! Where were you camping at?
by:
Greg
06/12/2026
toyota
Sienna
The airbags were difficult to install on a 2021 Sienna. It required removing the rubber stopper from inside the coil spring. Once that was out, install was easy. However, these need to be installed with the valve down as the plastic spacers fall out when the van is lifted for service when installed right side up as recommended. Upside down the air hose is routed thru the center of the plastic donut spacer which holds it in place when the van is lifted. However, once installed "upside down" the valves tend to pinch on the suspension as they move around. The pinching lets the air out and requires the bags to be frequently repositioned especially after the van is lifted for service. It is a good product, just unreliable and requires much inspection and maintenance to work properly. Will be loading up again for a summer trip and will need to reposition them so they work as I just had the oil changed. 3563458
by:
Dan
09/12/2026
It was more of a challenge getting the air bladder inside the coil on my Rav4 than advertised but got it finally. Luckily I had a vacuum pump for bleeding brakes and that helped suck it down as small as possible. There was no way the bladder would "return to its normal shape" without inserting 5-10 PSI once the top and bottom were within the coil then it unfolded and seated itself just fine. Also the upper protection bumper was not a tight fit on the threaded bolt and wanted to fall off but sticking a 3 inch piece of zip tie between the threads and the bumper did the trick. 3625777
by:
Tim O.
09/23/2026
Had a problem with my AirPads and contacted the ETrailer and spoke with Spencer, and he was extremely pleasant and very knowledgeable allowing me to get the replacement product in a timely matter before we went on our camping trip! I would recommend an E trailer to anyone looking to buy trailer parts! 3632132
by:
Steve W
08/23/2026
Installation was not complicated but was not easy either It took some effort to get the air bags folded up enough to slip them into the coil springs, I used a couple of zip ties to keep them compressed until in place The air bags and all the other parts seemed to be high quality 3613073
by:
John
08/16/2026
2025
toyota
Sienna
I installed these in my buddies 2024 Toyota Sienna Hybrid FWD. I installed with valves up and it took about 4 hours. I had to remove the springs to remove the stock upper bumpers. He's in a wheel chair and has a lift on the back. Going to test it out this week. 3608406
by:
Jarrod
07/14/2025
2016
Toyota
Land Cruiser
Easy install on lc200, it’s only been a couple days but test run with a trailer was great. Recommend getting getting inflation bracket (Firestone WR17607560) to reduce the need for any drilling if you don’t go with onboard compressor. 3370511
Great product. I must say that they were a little tough to install. A very tight fit. Fortunately for me I had the availability of a vacuum pump. With that I was able to evacuate all the air out of the bags which made them flatter, with that, it made it easier to slide them between the coil springs. I tow a small camper trailer, I usually run around 20 psi in the bags. This keeps my vehicle level and adds for a smooth ride. A great product. 1715669
After a year, the air bags have been superior in their performance. I have had no issues with them. Still running 20 psi in them when Im towing my trailer, deflating them to 10 psi when not. I see only slight rubbing signs on the bags from the coil springs, but hasnt effected the performance of the bags. Great product. Im very happy with the performance of the bags. Still a great product.
Robin H.
1/28/2025
@Joseph glad to hear it! Firestone makes great products.
by:
Jeffry
09/19/2026
2022
Ford
Maverick
Air bags are too small and don't do anything to level the truck or improve handling. Even at the full 35psi. Would not recommend. 3629839
by:
Daeton
04/14/2025
2022
Jeep
Gladiator
These were just as described as far as quality and look. The installation of them were a little more difficult than they show in the video but can easily be done by someone with basic skills. I would recommend if you have the ability to remove the springs and then just insert the bags that way as I couldn’t get one in without doing that. Otherwise the install is pretty straightforward. Haven’t used them with a load or towing yet but hopefully they will work as designed. 3299889
Thanks for posting the photos and for sharing what all you had to do to get them to work! It's what makes your review especially valuable to other readers. Thanks, Daeton
To replace the air lines on the Firestone Coil-Rite Air Helper Springs item # F4182 you can use the Firestone 1/4" Air Line Tubing item # F99ZR. view full answer...
Having an air suspension system with two separate Schrader valves would allow you to fine tune the suspension from side to side, like when carrying uneven or awkward loads in your vehicle. A system with a single inflation point would not provide this ability. If you carry an uneven load on a vehicle that only has one inflation point, the air pressure can migrate from the side with more weight placed on it to the other side, which can cause lateral instability.
Since using a single inflation... view full answer...
I have never heard of anyone end up with a broken spring when using SumoSprings such as # CSS-1125R. If that did ever happen it was probably because those people thought that they could overload the vehicle because they were using the SumoSprings. Which is not true, the vehicle capacity remains the same, it is just better supported.
With that said adding the SumoSprings will not grant you much, if any, additional height. They will help to keep the vehicle level if it is sagging. But there... view full answer...
Correct, the Firestone Coil-Rite system # F4182 would work inside of the coil springs on your 2012 Mitsubishi Outlander without the shocks in the center of the coil springs.
Installing the bags inside of the coil springs is easy enough and I don't think you will have any trouble with it. Routing the air lines will probably take just as long. I have included a link to the installation instructions so you can see what is involved. view full answer...
Yes, you could use any type of air pump or compressor that would inflate a car tire to inflate the Firestone Coil-Rite Air Helper Springs part # F4182.
You might also be interested in an on-board compressor so that you can inflate the bags whenever you needed to. For that you would want the Firestone Level Command II # F2158. view full answer...
Hey David, yes an air bag kit like the Firestone part # F4155 that fits your 2022 Toyota Sienna would do a great job getting rid of the rear suspension sag that you are experiencing currently. view full answer...
The diameter hose that is used on the Firestone Coil-Rite Air Helper Springs - Rear Kit, part # F4182, is 1/4 inch. You would need a Firestone Union Tee for 1/4 inch Tubing, part # F3025-1, if you wanted to use a single valve to fill both bags evenly on your 2007 Mitsubishi Outlander.
You may also be interested in a Single Inflation Valve, part # F3032-1. view full answer...
I have a suspension enhancement kit I can recommend for your 2011 Mitsubishi Outlander, the SumoSprings kit part # CSS-1125R, but there are no options from Firestone we can guarantee will fit. I wish I could say that the Firestone # F4182 would work for you but it's not a tested and confirmed fit.
The Sumo Spring kit though will work great and wont' require you to monitor air pressure in air lines either. view full answer...
The orientation of the air bags are going to be different for every vehicle. On some you even have the option to have the inlet at the top or the bottom. We do not have a video showing installation of # F4182 on a 2012 Mitsubishi Outlander but if we did it would be installed according to the instructions. view full answer...
The air lines included with the Coil-Rite system # F4182 for your 2009 Mitsubishi Outlander can handle the higher air pressure so having them inflate on one line would be fine.
Please note the installation instructions that I viewed on the Firestone site indicate the bags are rated for 5 to 35 psi, not 36. Not that 1 psi makes a difference but better safe than sorry. There should always be at least the 5psi minimum in the air bags at all times. view full answer...
There isn't a way to install a coil rite air bag in a coil that has a strut that runs down the middle of it. You'd have to use a Timbren kit like the part # CSS-1125R. view full answer...
The compressed springs should be about the same length as the air bags of the Firestone Coil-Rite Air Helper Springs - Rear Kit, part # F4182.
If you look at figure B of the directions you can see a picture of how the length of the extended spring should be in relation to the blue bag.
If you look on the right of this page you can see a picture of that portion of the directions and see that the blue bag is supposed be shorter than the spring when the spring is extended. view full answer...
I confirmed with our Firestone representative that the # F4182 Coil-Rite kit could be used in temperatures as low as -40º F, so you'd be fine and wouldn't need to remove the system in the winter. I've linked to a product demonstration video featuring the Coil-Rite kit. view full answer...
Your assessment of the Firestone air bags # F4182 for the 2008 Mitsubishi Outlander is correct. You would hitch up the trailer to the vehicle and then add air to level the ride. You can leave the air pressure the same with or without the trailer hooked up. You may notice a stiffer ride though when not towing because the tongue weight of the trailer will not be compressing the air bags or suspension.
The best solution for sag caused by a trailer is to use weight distribution. On a boat... view full answer...
I spoke with my contact at Firestone. He stated that they have just recently extended the model years the Firestone Coil-Rite Air Helper Springs - Rear Kit, # F4182, will fit. It will now fit the 2007 to 2010 Mitsubishi Outlander. I have included a link to the installation details below. view full answer...
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Led
4/17/2022
Not really helping, and theres a slow leak in one of the systems.