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Firestone Coil-Rite Air Helper Springs - Rear Axle

Firestone Coil-Rite Air Helper Springs - Rear Axle

Item # F4155
Our Price: $117.44
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Vehicle Suspension

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Firestone Coil-Rite Air Helper Springs - Rear Axle Air Springs F4155
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Product Expert Chris R

Is this right for you? Product Expert Chris R says:

Yes, if you:

  • If your vehicle is typically loaded to the max
  • Your loaded cargo is pretty consistent and doesn't change too often
  • You like the idea of a "set it and forget it" type system

No, if you:

  • You only ocassionally haul heavy cargo in your vehicle
  • You are just looking to smooth out the ride in your loaded vehicle a bit
  • You like the idea of being able to control your suspension
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 or call 1-800-496-5010 for expert service.
  • All Info
  • Reviews (475)
  • Q & A (0)
  • Photos
  • Why etrailer?

Firestone Vehicle Suspension - F4155

  • Air Springs
  • Rear Axle Suspension Enhancement
  • Firestone
  • Light Duty

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.


  • Provide extra support for your existing rear coil springs
    • Fit inside existing coil spring suspension on your vehicle
  • Keep your vehicle level when you are hauling a heavy load
    • Improve steering control and balance
    • Level your headlight beams
    • Reduce tire wear
  • Maintain even load distribution with air pressure, leveling off-center loads
    • Air bags adjust manually, side to side, with individual inflation valves
  • Enable more effective braking and handling
    • Work under heavy loading and adverse road conditions
  • Increase stability to promote a smoother ride and prevent bottoming out
  • Made of durable, elastic polyurethane for years of comfort and stability
  • Include all materials necessary for installation
    • Brackets, air springs, hardware, air line and separate valves for manual inflation
    • Switches and gauges, compressors, and air tanks (sold separately) are available for quick and easy air spring inflation/deflation from inside your vehicle
  • Made in the USA


  • 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.
  • Adjustable air pressure: 5 psi to 35 psi
  • Limited lifetime warranty on air springs
  • 2-Year limited warranty on hardware

Firestone Coil-Rite Air Spring Basics

Firestone Coil-Rite springs fit inside your existing rear coil springs to maximize the effectiveness of your suspension system. The added cushion provided by the air springs allows your vehicle to better handle a heavy load or trailer. Hauling heavy loads or towing a heavy trailer can make the rear of your vehicle sag and the front end rise. This puts more strain on your rear axle and reduces contact between your front tires and the road, causing problems with braking, steering control and traction. By adding air springs to your rear suspension, you can help to level your vehicle for more effective braking and handling under heavy loading or when you encounter adverse road conditions. The air springs also help to level your headlight beams and reduce wear on your tires.

Firestone Coil-Rite airline installation

Adjustable Air Pressure

The air pressure in your Coil-Rite springs can be adjusted manually, side to side, to compensate for off-center loads. A centered load improves the stability of your vehicle by reducing body roll. The air springs will also help to absorb road shock and soften contact between your axle and frame. This prevents bottoming out, thus improving ride comfort. Route the air line tubing for the springs to your vehicle's bumper to provide easy access to the manual inflation valves.

Firestone Coil-Rite air spring components

Air Spring Construction

Coil-Rite springs are constructed of durable, elastic polyurethane to ensure years of service. Single replacement springs (sold separately) are available for maintenance to an existing Coil-Rite kit.

Air Spring Installation

The Coil-Rite springs install inside your existing coil springs. The custom-fit springs attach to your vehicle's spring seats.

W237604155 Firestone Coil Rite Air Bags - Suspension Kit - Rear Axle

Firestone 4155

Installation Details F4155 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Firestone Coil-Rite Air Helper Springs - Rear Axle - F4155

Average Customer Rating:  4.4 out of 5 stars   (475 Customer Reviews)

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.


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.

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.
Bill - 10/22/2022

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.


Etrailer and Firestone have some great customer service. This kit was fairly simple to install

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.


Didn't fit

Did you try putting a little bit of dish soap on the bags and sliding them into position. Then you can just spray them off.
-- Etrailer Expert David B - 09/20/2022


Box was a little damaged but contents was unharmed. Things look good. Dealing with etrailer has always been a good experience

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.

I just came back from another trip and it worked well.Once installed it is easy to inflate and deflate as needed.
Don R - 10/11/2017

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!

Two years out, and still happy as a clam. Just do it!
Cal P - 03/11/2018


All parts there to install, no buying necessary parts that are not included. Instructions and video will make installation straightforwRD

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.

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.
Bruce B - 02/01/2016

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.


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.

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!

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.

Toyota Sienna

This was my second order with Etrailer. 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.

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.


Very useful for heavy loaded road-trips (fully loaded mini van) or trailer attachments.
Easy to install and use. Definitely a recommendation!
Thank you e-trailer team!







Fit exactly as described, installation was not difficult


2013 Toyota Sienna

Great product in a very low price

Show More Reviews

See what our Experts say about this Firestone Vehicle Suspension

  • Rear Suspension Enhancement Recommendation for 2018 Toyota Sienna
    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...
    Image 1 for
  • Valve Stem Location Recommendation for Firestone Coil-Rite Air Spring on a 2006 Toyota Sienna
    The first priority for the valve stem location when installing Firestone Coil-Rite Air Helper Springs # F4155 is that the airlines will be routed in such a way that they would not come in to contact with any areas that might pinch or melt the lines. With that being said, I have seen a lot people install them into the rear bumper, out of the way of anything that might hit it, and not directly behind a wheel to prevent road grime from building up on it too much. You would do this by drilling...
    view full answer...
  • Recommended Suspension Enhancement For 2022 Toyota Sienna
    I recommend the Firestone Coil Rite, # F4155 for your 2022 Toyota Sienna. Firestone is known to have higher quality air bags than the competition and this kit easily installs by slipping into the coil spring on your Sienna. This will allow you to inflate the air bags as needed to compensate for loads but have "normal" ride quality when not heavily loaded and have tongue weight from a trailer. Please note the linked product review and installation videos below.
    view full answer...
  • Best Rear Suspension Enhancement For 2021 Toyota Sienna
    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...
  • Where To Route Air Line on 2021 Toyota Sienna with Firestone Coil-Rite Air Helper Springs
    I checked with Firestone and confirmed the Firestone Coil-Rite Air Helper Springs part # F4155 for a 2021 Toyota Sienna (FWD). It looks like we have installed a few of these kits on some older models, in these the air line went through the top of the spring mount. I don't show any obstructions in the way but if you do have any then you make need to make an opening, you shouldn't have to drill through metal or anything though.
    view full answer...
  • Helper Springs For A 2018 Toyota Sienna
    The Firestone Coil-Rite Air Helper Springs # F4155 comes with everything you need when installing helper springs on your 2018 Toyota Sienna. Using these helper springs will increase the stability to promote a smoother ride and prevent bottoming out on your Sienna. The springs are made out of a durable, elastic polyurethane which will provide comfort and stability. The load-leveling capacity for these helper springs is at least 500 pounds (at most 1,000 pounds). They have an adjustable...
    view full answer...
  • Suspension Enhancement Recommendation for 2020 Toyota Sienna
    We have one air bag kit that fits the rear suspension of your 2020 Toyota Sienna with the Firestone Coil Rite kit part # F4155 which gives you the ability to add support to the rear suspension of your 2020 Toyota Sienna like you are needing. This will help with cargo in the rear of the vehicle as well as when towing.
    view full answer...
  • Suspension Air Bag Kit For A 2022 Toyota Sienna
    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...
  • Installation Process for Firestone Coil-Rite Air Helper Springs # F4155 in 2005 Chevrolet Uplander
    In your 2005 Chevrolet Uplander the Firestone Coil-Rite Air Helper Spring Kit # F4155 will install with its air valve at the bottom of the spring. The vehicle's bump stop is to be removed and the included spacer will be placed at the bottom of the air spring in your installation. The written instructions are linked for your reference. Always keep these springs inflated to at least their recommended minimum pressure of 5-psi and never exceed the 35-psi limit. If you prefer to have automated...
    view full answer...
  • What Is Included In The Package With Firestone Coil-Rite Air Helper Springs
    The Firestone Coil-Rite Air Helper Springs, part # F4155 price includes both air springs, includes all materials necessary for installation. To make it easier to control inflating or deflating of the air springs from the driver seat I recommend installing an onboard air compressor system like part # F2158. This comes with a gauge that lets you keep track of the amount if air you have in the air spring system.
    view full answer...
  • Do Firestone Coil-Rite Air Helper Springs Fit 2021 Toyota Sienna FWD
    I went ahead and double-checked with the manufacturer, Firestone, for you just to make sure, and can verify that yes, the Coil-Rite air springs will absolutely fit your 2021 Toyota Sienna with front-wheel drive. The correct part for your '21 Sienna is the following: - Firestone Coil-Rite Air Helper Springs # F4155 These air springs are going to do a superb job of helping keep your Sienna level and giving you the best handling while under load, such as when towing. They are going to give...
    view full answer...
  • Trailer Hitch Recommendation for 2009 Toyota Sienna LE for Carrying Motorcycle Carrier
    For your 2009 Toyota Sienna there are no hidden trailer hitches that fit so your best option is going to be the Draw Tite part # 75237 which has the highest tongue weight capacity of 675 lbs. Rear suspension enhancement would be a great option too to prevent suspension sag when carrying the weight of the carrier and your motorcycle. For that you'd want the Firestone # F4155 and you'd be set.
    view full answer...
  • Recommended Air Springs for 2005 Toyota Sienna to Reduce Body Roll
    The Firestone Coil-Rite Air Helper Springs # F4155 will help reduce body roll and will improve both steering control and balance on a winding highway whether loaded or unloaded. It will level your headlight beams to give you a clear view of the road. This system also reduces tire wear and assists with braking. Improving the stability and stance of your minivan will help with many aspects of the ride of your vehicle. These springs fit inside your current coil springs to enhance your...
    view full answer...
  • Troubleshooting Leaking Firestone Air Bag Problem in 2008 Chevrolet Uplander
    Thank you for your purchase of Firestone Coil-Rite Air Helper Springs # F4155 for your 2008 Chevrolet Uplander. I suggest your mechanic begin his troubleshooting at the bag that deflated. If he inflates the bag to about 30-psi (near its 35-psi maximum) and applies soapy water to all connection points and the bag surface too he can check for air leaks. It is not necessary to remove the system from the Uplander to do this testing. The same test can be done wherever he can access the air...
    view full answer...
  • Suspension Enhancement Fit for 2014 Toyota Sienna AWD
    I have a solution for you, but unfortunately the Firestone Coil-Rite Air Helper Springs # F4155 are not confirmed to fit your 2014 Toyota Sienna AWD. I spoke with my contact at Firestone and he confirmed they do not list this kit as a fit for the AWD Sienna. For a coil spring suspension enhancement system, I recommend the Air Lift 1000 Air Helper Springs for Coil Springs # AL60732 because they are confirmed to fit your Sienna AWD and are similarly designed to the Firestone air bags. When...
    view full answer...
  • Rear Coil-Rite Helper Springs for a 2013 Toyota Sienna Do Not Require a Heat Shield
    The Coil-Rite helper springs # F4155 fit inside of the rear coil springs on your 2013 Toyota Sienna. The exhaust is not close enough to cause any problems. Also, the coil springs themselves would also help dissipate any heat. I have included a link to a video showing an example installation for you. Like you said, the Air Lift springs # AL60732 do come with a heat shield as a fail safe. I have linked a video of this kit as well. The Air Lift system is a good value so if the heat shield...
    view full answer...
  • Recommended Suspension Enhancement for a 2011 Toyota Sienna Firestone Vs. Timbren
    The Firestone Coil-Rite Air Helper Springs part # F4155 and the Timbren Rear Suspension Enhancement System part # TTORSEN04 will both do a great job of helping handle the added weight on the rear of your 2011 Toyota Sienna which will in turn decrease vehicle sag. The Timbren springs are more designed for towing as they are stiffer and provide more support than the airbags. The airbags will still give you plenty of support for your bike rack and will not sacrifice ride quality whereas...
    view full answer...
  • Cover Recommendation for 2020 Rockwood 2280BHESP
    For the length of your 2020 Rockwood 2280BHESP the best storage cover for the climate you mentioned would be the Aquashed SFS part # 290-12295 that you referenced. This fits the best and will do the best in your winter climate. Then for air bag suspension support for your 2015 Toyota Sienna the Firestone kit part # F4155 would do an excellent job giving you additional support when towing.
    view full answer...
  • Self Tapping Screws for Install of Firestone Kit F4155 and 18140
    We used the self tapping screws part # FA1131822 for the install of the # 18140 with the # F4155.
    view full answer...
  • Trailer Hitch Recommendation for 2021 Toyota Sienna with Higher Tongue Weight Capacity
    For your 2021 Toyota Sienna we have the Draw Tite hitch part # DT55MR as a confirmed fit that has a tongue weight capacity of 675 lbs. You might also be interested in rear suspension enhancement with the Firestone part # F4155 which will give you the ability to add additional support to the rear suspension to prevent sagging from the weight of the carrier and scooter.
    view full answer...
  • Suspension Enhancement for 2021 Toyota Sienna
    Yes, I recommend the Firestone Coil-Rite Air Helper Springs # F4155. I recommend these because of the additional support they add directly to the factory installed coil springs. When inflated they will help eliminate side-to-side movement, improving overall stability, and help remove squat.
    view full answer...
  • Why Does Firestone Coil-Rite Air Helper Springs Come with 2 Air Lines
    Well you would not want either bag to leak! But you can use a T-fitting to run both lines to one line and fill the bags at the same time. However, if you want to be able to level the vehicle side to side, you would need two separate lines which is why they come with one for each air bag. For a T fitting you can use # F3273-1. I also recommend a tube cutter # AL10530 to get a nice straight cut on the air lines. A cut that is not straight is more likely to leak.
    view full answer...
  • Rear Axle Firestone Air Bag Suspension Enhancement Kit for 2014 Toyota Sienna 2WD
    Van-style vehicles like the Toyota Sienna and Honda Odyssey do sit fairly low in the rear end. By the time you add the presence of a trailer hitch, load some cargo and passengers, and apply the hitched trailer's tongue weight (TW) to the hitch ball you can absolutely find yourself looking for some extra support for the rear suspension. The linked page shows you the options for your 2014 Sienna 2WD and these include both air bag kits # AL60732 and # F4155 and a rubber jounce spring kit...
    view full answer...
  • Recommendations for 2011 Toyota Sienna and Motorcycle Carrier
    For your 2011 Toyota Sienna, I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" # 75237. Using this trailer hitch receiver, you can use the etrailer Motorcycle Carrier w/ Ramp for 2" Hitch - 76" Long - Steel - 500 lbs # e98873 which weighs 58 lbs. When you use this carrier, it would be wise to use a suspension enhancement to keep the back end from sagging. I recommend the Timbren Rear Suspension Enhancement System # TTORSEN04 for your application...
    view full answer...

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