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 F4155 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Firestone Vehicle Suspension
- F4155
Highlights
Custom Fit for Your Vehicle: Mounts to existing attachment points
1,000-lb Load Support: Adds cushion inside rear coils to level heavy loads and prevent sag.
Smoother, Safer Ride: Keeps the vehicle stable under load for better control and braking.
Custom Air Adjustment (5–35 psi): Tune pressure for towing or daily use to improve comfort.
Prevents Bottoming Out: Absorbs road shock and keeps suspension from hitting hard under weight.
Durable Polyurethane Construction: Stays elastic for years of reliable support and stability.
Features to know about
Stay Level and Confident Under Load: Air Springs That Eliminate Sag
When heavy cargo or a trailer starts to weigh down the rear, these Firestone Coil-Rite Air Helper Springs keep things level. Each polyurethane spring fits inside your existing rear coil spring to add load-leveling support of at least 500 lbs and up to 1,000 lbs. By holding the rear steady, steering and braking stay consistent, headlight aim remains correct, and tire wear is reduced. Whether you’re hauling tools or towing for the weekend, the suspension stays balanced so driving feels controlled instead of saggy and unstable.
Smooth Out Rough Roads: Adjustable 5–35 psi Air Pressure
The air pressure in each spring can be tuned manually between 5 psi and 35 psi to match your load or road conditions. Inflate evenly for a standard setup or independently side to side to even out an off-center load. Keeping the right pressure helps absorb road shock, reduce body roll, and prevent bottoming out on dips or bumps. You get a smoother ride when unloaded and better handling when carrying weight, all from a simple adjustment at the inflation valves mounted at the bumper.
Built to Handle Real-World Use: Durable Polyurethane Construction
These Coil-Rite springs are made from tough, elastic polyurethane that stands up to years of heavy loading and rough roads without losing shape. The material resists wear, stretching, and cracking for long-term performance. Even under adverse road conditions, they maintain stability and protect the factory suspension from harsh impacts that can cause bottoming out or premature wear.
Straightforward DIY Setup: Everything Needed for Installation
The kit includes the brackets, hardware, air line tubing, and separate valves for manual inflation—everything required for installation. The springs fit inside the existing coil spring seats without major modifications. With basic hand tools and attention to routing the airlines away from heat or pinch points, most installs are straightforward for a DIYer who likes doing their own upgrades. Optional switches, gauges, compressors, and air tanks can be added later for in-cab inflation control if needed.
Specs
Weight and Capacity
Load-leveling capacity: at least 500 lbs (at most 1,000 lbs)
Pressure
Adjustable air pressure: 5 psi to 35 psi
Warranty
Air springs: Limited lifetime warranty
Hardware: 2-Year limited warranty
Note
Construction material: 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...
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:
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:
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:
Nicholas
05/02/2026
2023
Toyota
Sienna
I've yet to install these, I will update once complete. But I've heard from numerous people that if you life the van at the jackpot and let the weight of the tire extend the spring, you can remove the stopper with channel locks and slide the bag in using a liberal amount of soap, so you don't need to disassemble the axle. Again, I will update when completed. 3537680
by:
John L.
12/09/2013
2006
Toyota
Sienna
I put these on two Toyota Siennas ('06 and '09). Installation was "easy" without any special tools to speak of. I didn't have to remove the bottom bolt of the shock. If you collapse the rubber and use the red plugs to hold them without air, they will fit between the spring coils with a little coaxing. So far very happy with both. Have had the vehicles loaded heavily multiple times and the difference in load capacity and handling while full is impressive. Ride can be a little stiff if you leave the air pressure at 35lbs without a load. I find around 25lbs is perfect for average use. Anyone with a Sienna knows that loaded down and the trailer hitch will drag in and out of parking lots etc. No longer with these on! Drilled through the bottom of the plastic bumper on one for the valves. The other one I attached an angle bracket to the plate where you would mount a larger trailer power plug.
Would absolutely recommend these to anyone with a Sienna.
JL in SC. 109652
This system require drilling on even though this item says no drilling is required, the 2021 and newer Toyota Sienna FWD models require drilling. This is direcred in the toyota minivan specific instructions. You have to download the specific instructions for the Sienna that are linked in the description of the item. 1579457
You are 100 percent correct! I am having our fit guide updated. Thank you for letting us know.
Jenny N.
5/23/2023
I understand where you are coming from as at first I believed that we needed to update the site. However when we mean no drill in this application we mean that you do not need to drill bolt holes into the vehicles frame. All of the air springs kit will require a hole to be made for the air line nozzle.
by:
Richard
03/17/2024
2021
Toyota
Sienna
I have purchased 3 sets of Coil-Right. The product is very good but the installation instructions were terrible. The first set (2023) I installed per video instructions and it failed. The puck that is placed at the top of the bladder fell of and caused a catastrophic failure. The bladder was punctured and was basically destroyed. The second set (2023) I installed per the video but I enlarged the hole in the puck to help is stay on top of the bladder It failed also. The third set (2024) installed per the new installation instructions which removed the bump stop at the top of the tower. So far they seem to be working better but I think eventually the puck will diappere because there is nothing to hold it inside the spring. Time will tell. This is the only product for my vehicle I can use. 2021 Toyota Sienne LE. 1749244
The airbags is working out well so far. Install video was a great representative of what it took. Only reason I didn’t give it 5 stars was the packaging. Outer box was perfect, actual product packaging looked like it was used a soccer ball. . 3578478
by:
Don R.
10/05/2016
2008
Toyota
Sienna
I did not actually time the install but I believe it was less than an hour. I have been loading my 2008 Sienna very heavy when going on vacation. This last time my trailer hitch that I use to haul 5 bikes dragged leaving the driveway and was just a few inches off of the pavement when sitting on the level. I installed this system and tested the load with live body weight, I had a family visiting, they crawled into the van and it did not sag half as much as before. My next big trip is coming up in a week, so we will be giving it the full road test then. I recommend this product. 303574
Don R.
10/11/2017
I just came back from another trip and it worked well.Once installed it is easy to inflate and deflate as needed.
by:
Bruce B.
01/31/2015
2011
Toyota
Sienna
This Firestone #F4155 air-bag product is excellent. The fit to my 2011 Toyota Sienna was just as described. I installed the bracket and the two air-fill valves in the jack compartment, easy to get to and out of the weather. etrailer has been a pleasure to deal with. 172005
Bruce B.
2/1/2016
Love the product. Had it installed by my favorite local Toyota dealer. Makes a nice difference towing our Park Liner Fiberglass Egg Camper. Would certainly recommend.
by:
Cal P.
03/09/2017
2015
Toyota
Sienna
I'm very happy with my Firestone Coil-Rite kit for my '06 Sienna. I added a
"Tee" to join the bags together and routed the schrader valve to exit inside my fuel fill door. It was a little extra work, but well worth it as it's out of the weather and sight, and I don't have to scrabble around on the ground in the slop to check / adjust the pressure. I run 15 -17 lbs when I'm not hauling a load and that seems to help with body roll, and up to 25-28 psi fully loaded. The kit does the job it was intended for, and hasn't leaked a snif of air since I installed it a year ago. Three thumbs up! 350292
Cal P.
3/11/2018
Two years out, and still happy as a clam. Just do it!
by:
Bill
10/21/2021
Product works as advertised. Surprising held most of its pressure after a year without further inflation. Provides very good suspension assistance when trailer tongue hitched to minivan. 1184935
Bill
10/22/2022
Air bags are still performing as expected. The additional surprise is how well they hold their pressure with time. Thanks again for a very good product.
by:
Larry Hasbrouck
04/15/2026
My 2023 Toyota Sienna AWD was having major problems with the rear sag when we put a hitch and a bike rack on. The bike rack would sag so bad that it would scrap on the smallest of bumps. I am still worried it has damaged my nice bike rack pretty badly. I had a friend of mine help me install these on my van and it has worked much better now. I am still debating lifting the van a little but that is not the Firestone helper springs problem. They have worked great so far. I also installed the tee so that I just have to air it up from one valve. 3522358
Lazer S.
4/21/2026
Glad they are working well for you, Larry! Sorry to hear you having so much sag beforehand though. It is a fairly common occurrence, especially with bikes and cargo. How many bike are you typically carrying? And did they affect your unloaded ride at all?
by:
Alexander
09/02/2023
Toyota
Sienna
I use my Toyota Sienna as my work van, so it's loaded with tools and supplies. It's heavy enough that the rear suspension sags, and the car rocks forward and back on rapid deceleration. I was almost ready to pay for a custom suspension before I found this product. I've been using it for a year and I can't say enough good things. It was reasonably easy to install, had to get some ramps and a creeper, but the rest of the installation was tool free. I measured the height of the front fender to the ground (highest point of the gender) and inflated the system until the rear fender was within 1/2"of that. For me it wound up getting 28 psi. Just short of the 30 psi max working pressure. The benefits were immediate. My acceleration improved, because the car didn't rock back as much when accelerating. Surprisingly, my breaking got better, which makes a little sense, since the car was only leaning forward, and not teetering back and forth. Best of all, the van was no longer leaning like a motorcycle every time I made a turn. The entire driving experience improved massively. It's been a year, and things are still going strong. Well worth the money. 1659924
by:
Terri
10/27/2018
Still holding pressure and does what I need. Van is more stable unloaded, even with new shock dampers it's better. With a full load of hundreds of pounds in back the van is much more stable and does not wallow like a whale near as much. Towing trailers is much better too. Didn't expect airbag pressure to hold for months and months but no leaks so far. Only issue was as expected...little bit of elbow grease to install bags and find best airline routing. some bag rubbing squeeks in the coils but I did expect some inherent to it's design. Nice product I would recommend to friends. 577987
by:
E
07/07/2014
2008
Toyota
Sienna
I installed Firestone Coil-Rite Air Helper Springs and they work great. With minimum air pressure they improved the unloaded ride and driveability. Loaded the van for vacation, added air pressure to bring the ride height back to the normal ride level and the van drove and handled better than when it was new.
Followed your on-line installation video and installation was a breeze.
The installation instructions with the kit were poor and incomplete.
. 139788
by:
David
10/07/2022
2015
Toyota
Sienna
Units was fairly easy to install. It was a complete kit and they work great ! I would recommend these air bags to anyone looking for such a product. 1442576
David
10/18/2023
They air lifts are working well.
Mike L.
11/9/2023
@David We're happy to hear that!
by:
Scott M
09/15/2016
2011
Toyota
Sienna
These were surprisingly easy to install using ramps and a floor jack and really helped with preventing our Sienna from bottoming-out when carrying heavy loads on the hitch mounted luggage carrier. Highly recommended. Be sure to watch the installation video on etailer! 295055
by:
Karl
01/22/2022
All parts there to install, no buying necessary parts that are not included. Instructions and video will make installation straightforwRD 1250487
Karl
1/23/2023
Working great, keeps tail of car at correct height. Cut the air lines when installing as directed. Do not use sidecutters.
by:
Marc
05/29/2014
2006
Toyota
Sienna
Installed on 06 Sienna. Bought these for towing our 16' boat. Had a mechanic buddy put the bags in and ran air lines myself. Had one initial leak but I recut the end of the air line and it works fine. Noticeable difference when inflated to 25 psi. Some slow pressure loss over 24 hrs but well within driving times needed. Overall excellent service from etrailers and a very good product so far. 133395
by:
William
08/03/2023
Toyota
Sienna
I had these installed on my Toyota Sienna one year ago and I couldn't be happier with the product. I frequently load the vehicle with heavy DJ and sound equipment and when inflated to about 35 psi, the air springs provide perfect support. No more squatting or handling like a boat going down the road. I highly recommend! 1638110
by:
Duc
03/13/2024
I had these installed in the rear of my 2023 Toyota Sienna Limited after getting it lifted with the Journeys Off-road lift kit. Installation went smoothly with no issues. Initially, there were some squeeking, but that went away after a couple of months. 1746915
by:
Tad
08/26/2022
Etrailer and Firestone have some great customer service. This kit was fairly simple to install 1376683
by:
CM
05/27/2016
2011
Toyota
Sienna
Excellent product, installed on 2011 Toyota Sienna that tows 3,000# Hybrid Travel Trailer. Works great to keep rear level (along with Anderson Hitch Weight Distribution). We now run air in them without the trailer as well to help prevent typical Sienna sag when loaded with people or loads. 252191
by:
Mark M
07/06/2011
Toyota
Sienna
AWESOME. Product went out same day it was received. Great service and pricing, with service being the most important to me. The air bag support system for my Toyota Sienna van's rear spring coils was easy to install with very minor modications. They made a huge difference on the back end of the van "hitting" the ground when loaded. Just what I needed to pull a trailer. 18542
Hello Nick, thanks for reaching out.
To answer your first question, coil helpers like the Firestone # F4155 will not raise your Sienna beyond the factory ride height. If the hitch and bike rack are causing some squatting, the air bags will help to minimize that. I used to have a 2013 Sienna and it rode pretty low as well. Really no good way around this unfortunately.
For the second question, the # AL25804 compressor is a single path compressor, meaning both bags will be inflated to... view full answer...
We do have an air bag suspension enhancement kit that fits your 2021 Toyota Sienna with the Firestone part # F4155 that you referenced. view full answer...
Hey Lg; the Firestone Coil-Rite Air Helper Springs # F4155 only fit the 2WD models. You may be able to use the Air Lift 1000 Universal Air Spring Kit like the # AL60908. However, you will have to measure to find the correct kit.
First, unload your vehicle to make sure it's at normal ride height. Next, measure the inside height of your coil spring which will be from the upper spring seat to the lower spring seat. Finally, measure the inside diameter of the spring at its widest point. Once... view full answer...
Hello William,
Thanks for writing in, you are correct the Firestone #F4155 is not a good fit for the 2021 to 2024 Sienna Hybrid. The hybrid models have some key differences in the rear suspension area due to battery placement and tighter coil spring spacing. Because of that, air bag kits like the 4155 do not have confirmed fitment, which can lead to interference or installation issues and the possibility of still dealing with rear sag after spending the money.
A much better and proven... view full answer...
Hey Nathaniel, thanks for your question.
The Firestone Coil-Rite kit # F4155 is only designed to fit 2-wheel drive models, so it would not be the correct fit for your AWD Sienna.
For your AWD model, the correct option is the Air Lift 1000 Air Helper Springs for Coil Springs # AL60732. This kit is designed specifically to work with the AWD suspension, so you won’t run into any fitment issues.
The helper springs will give you added support to help with sag when you’re loaded up, while... view full answer...
Hi Carlos,
For your 2025 Toyota Sienna you need The Firestone Coil Rite Air Helper Springs, part # F4155. These are the only air bags we carry for your Sienna, and you do not need a compressor. The kit includes the air springs, air lines, Schrader style inflation valves, and the hardware needed for installation, so you can simply adjust the pressure manually when your load changes.
These fit inside the rear coil springs and give you up to 1,000 pounds of load leveling support with adjustable... view full answer...
Hello Greg,
I am very sorry that you are already having issues with your Firestone fittings. Good news is that the Firestone Coil-Rite Air Helper Springs - Rear Axle # F4155 comes with a 2-Year limited warranty on the hardware. Firestone prefers to handle all of their own warranties so you will need to reach out to them directly to file a claim.
Firestone: 1-800-888-0650 Option 1, then Option 1 for Warranty or [email protected]
What are you hauling around that you need the extra support? view full answer...
Hello Nancy, thanks for reaching out. The Firestone Coil-Rite Air Helper Springs # F4155 are NOT going to fit the AWD model of the 2023 Sienna.
The only potential option for suspension enhancement would be the Coil SumoSprings Custom Helper Springs for Coil Spring Suspension # CSS-1168R. You will need to measure your coil springs to confirm fitment though.
What you can do is take their cutout tool and hold it up to your coil springs. I can't add the picture here and keep it to scale... view full answer...
For your 2018 Toyota Sienna the suspension enhancement kit I recommend is the Firestone Coil Rite part # F4155 because Firestone is known to have higher quality air bags than the competition. This kit installs by slipping into the coil of your Sienna. Check out the picture I attached that shows it installed. I also attached an install video for this kit on a similar Sienna for you to check out too. view full answer...
Hey, Alan.
Thanks for sharing your VIN with us! For your 2023 Sienna XLE there are currently two rear suspension support options that are confirmed to fit. One is the Firestone Coil-Rite air helper springs, part # F4155, and the other is a rear coil spring upgrade, part # CSS-1168R. At the moment, we don't carry any complete replacement suspension options, just the enhancement kits.
The Sag that you're experiencing is pretty normal for your van when under a load. These kits will help... view full answer...
Hey Jansen, thanks for reaching out. I actually laughed out loud at that in-laws comment. Nice one!
To answer your question unfortunately, no, the Firestone Coil-Rite Air Helper Springs # F4155 will not work on the AWD Hybrid model of the 2021 Toyota Sienna.
If you need to beef up the rear suspension a bit, what you can use are the Coil SumoSprings Custom Helper Springs for Coil Spring Suspension # CSS-1168R. These insert between the coils and help add stability and reduce any in-law... view full answer...
Hi Roy!
We do indeed have an air bag kit for a 2022 Toyota Sienna, but it is from Firestone. I still do not see anything offered by Air Lift for your vehicle, unfortunately.
That said, check out the Firestone Coil-Rite Air Helper Springs - Rear Axle # F4155. These will fit as long s you don't have an all wheel drive model and will get you plenty of support. If you do happen to have an all wheel drive model, you will need to go with the Coil SumoSprings Custom Helper Springs # CSS-1168R.
What... view full answer...
Hello John,
Thanks for writing in!
Yes, the Coil SumoSprings # CSS-1168R for the rear and # CSS-1195F for the front are both confirmed fits for your 2024 Toyota Sienna XLE FWD and will help support the suspension when you have the van loaded down.
For the rear, though, I actually prefer the Firestone Coil-Rite Air Helper Springs # F4155 if sag is your main concern. Since they are adjustable, you can add air when you have the Sienna loaded down and adjust them as your load changes. I... view full answer...
Hello Juan,
Congrats on the new ride! We have 2 options for suspension enhancement for your 2025 Toyota Sienna. The Coil SumoSprings Custom Helper Springs for Coil Spring Suspension - Rear Axle # CSS-1168R, and the Firestone Coil-Rite Air Helper Springs - Rear Axle # F4155. I would personally go with the # F4155 for your situation. If you were just going to use it for the bike rack I would go with the # CSS-1168R, but since you are going to be towing a light skiff, having the adjustability... view full answer...
Hello John, thanks for reaching out. I looked up that Woodland edition Sienna and that looks pretty sweet! I recently got rid of my 2013 Sienna XLE and I loved that van. Unfortunately, with the Woodland edition being AWD, this rules out any air bag kit, like the Firestone # F4155, which will not fit AWD models.
It might be possible to use the Coil SumoSprings Custom Helper Springs like part # CSS-1145R, but you will need to measure the distance between the coils to confirm which one will... view full answer...
Hey Peter, so we have suspension enhancement that fits your 2024 Toyota Sienna with the Coil SumoSprings part # CSS-1168R but the Firestone Coil Rite you mentioned is not a fit and there isn't a similar kit that does. It's hard to say though if the SumoSprings kit fits lowered springs though but it would be best chance of working. view full answer...
Hey Gerard, that's a really good point and I'm glad you noticed it haha. People do seem to like to install these kits upside down and we tell them all the time they have to follow instructions but we can't force them to do it the right way.
The only one I would disagree with is the T in the air line. Using that to inflate the bags to the same psi does not mean that the pressure would transfer to the other bag around corners as the bags don't expand when pressure is added to them. They... view full answer...
I checked with Firestone, the Firestone Coil-Rite Air Helper Springs part # F4155 are not listed as a fit for AWD models. That said, I also checked with Air Lift and the Air Lift 1000 Air Helper Springs for Coil Springs part # AL60732 are a fit for all models. Therefore, you really don't have an option for which to go with but I would choose Air Lift anyway even if you did as they provide a tee fitting so you can fill both air bags with one port and they use a black air line which is easier... view full answer...
I do see that Firestone just added their Coil-Rite Air Helper Springs # F4155 as a confirmed fit for your 2024 Toyota Sienna LE. I would recommend installing the Air Lift WirelessAIR Compressor System # AL74000 with the air springs. This compressor has a smart manifold which will monitor the air pressure while you drive and make adjustments should the pressure change by more than 3psi. This will help protect the air springs from damage due to underinflation. view full answer...
When comparing the Air Lift # AL60732 and Firestone # F4155 kits for your 2015 Toyota Sienna, it's true that we typically mention the Firestone bags have a better construction, but that's normally with their standard air bags. For the coil-type air springs the quality is essentially the same. For this application I actually like the Air Lift kit better so that's what I recommend going with.
Since these kits have air bags and air lines involved both off them have the same amount of maintenance... view full answer...
Per the manufacturer The Firestone Coil-Rite Air Helper Springs # F4155 is confirmed to fit your 2022 Toyota Sienna, and are for rear axle suspension only.
These bags will fit inside your existing coil spring suspension on your vehicle. The bags are made out of a durable, elastic polyurethane. They have a load-leveling capacity at 500 pounds, and have an adjustable air pressure between 5 psi to 35 psi.
The coil-rite springs will not increase your vehicle's weight-carrying capacity.... view full answer...
The only suspension enhancement confirmed to fit your 2017 Hyundai Santa Fe Limited is the Coil SumoSprings Custom Helper Springs # CSS-1145R. These provide support to the coil springs on your vehicle. For air springs like the # F4155 you looked at, you may be able to use an Air Lift 1000 Universal Air Spring Kit like # AL60920.
Finding the correct kit will require taking some measurements. First, unload your vehicle to make sure it's at normal ride height. Then, measure the inside height... view full answer...
I would be happy to answer those questions for you. The Air Lift 1000 Air Helper Springs for Coil Springs item # AL60732 provide 1,000 lbs of support. Anything over that maxes out the system and it won't work as well. It is recommended not to exceed this capacity. The Firestone Coil-Rite Air Helper Springs item # F4155 is a nearly identical kit with the exception of the valves. With cost and availability being practically identical I would choose the Firestone kit over the Air Lift because... view full answer...
By far the best suspension enhancement for your 2021 Toyota Sienna are air helper springs:
- Firestone Coil-Rite Air Helper Springs # F4155
The reason the Coil-Rite # F4155 are the best is due to the amount of additional support they add directly to the coil springs on your Sienna. When inflated they will help eliminate side-to-side movement, improving overall stability, and help remove squat.
With less squat - and the weight more evenly distributed to the front and rear of your '21... 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.
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....