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  1. Vehicle Suspension
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  4. Rear Axle Suspension Enhancement
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Firestone Coil-Rite Air Helper Springs - Rear Axle
Firestone

Firestone Coil-Rite Air Helper Springs - Rear Axle

Part Number: F4155
In Stock
$120.94
Vehicle Suspension

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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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  • Reviews (670)
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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.


Features:

  • 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


Specs:

  • 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


Note: The construction material of the fittings may vary.


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

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   (670 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.

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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...
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  • Comparing Air Lift and Firestone Air Bags for a 2019 Toyota Sienna AWD
    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...
  • What Suspension Enhancement is Recommended for 2025 Toyota Sienna For Bike Rack and Light Skiff?
    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...
  • Air Bag Suspension System Options and Rear View Camera for a 2017 Toyota Sienna
    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...
  • Air Bag Helper Springs and Compressor System Recommended For a 2024 Toyota Sienna
    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...
  • 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...
  • 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...
  • Air Bag Suspension Kit for 2021 Toyota Sienna AWD
    We do have an air bag suspension enhancement kit that fits your 2021 Toyota Sienna AWD with the Firestone part # F4155 that you referenced.
    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...
  • Air Lift or Firestone Air Bags for a 2015 Toyota Sienna
    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...
  • Air Bag Suspension Kit Recommendation for 2021 Toyota Sienna AWD
    Yes we do have an air bag suspension enhancement kit that fits your 2021 Toyota Sienna AWD with the Firestone part # F4155 that you referenced.
    view full answer...
  • Recommended Suspension Enhancement For A 2013 Toyota Sienna XLE
    Yes we have just the thing. For your 2013 Toyota Sienna XLE I recommend the Firestone Coil Rite Air Helper Springs # F4155. This is an air spring that inserts inside the rear coil spring. You can inflate the air spring up to 35 PSI to help beef up the factory coils. They have a 500-1000 lb capacity, so it will give plenty of support, even to a larger model like your XLE. These are great for hauling everyday cargo and will undoubtedly improve your ride quality, handling and braking. The...
    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...
  • Towing Setup Questions For A 2019 Toyota Sienna XLE AWD
    I would agree that if you foresee the need to tow in the future and use a weight distribution system or just want to have the option, the Draw-Tite hidden hitch style # 76112 is the better option for you. I did contact the manufacturer on your behalf and clearance as far as distance from the bottom of the bumper to the top of the receiver is less than 1/2" for both, so no difference between them. Same story as well for the measurements out to the edge of the bumper. The only real difference...
    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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...


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