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Firestone Coil-Rite Air Helper Springs - Rear Axle

Firestone Coil-Rite Air Helper Springs - Rear Axle

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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. Lowest Prices for the best vehicle suspension from Firestone. Firestone Coil-Rite Air Helper Springs - Rear Axle part number F4118 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Firestone Vehicle Suspension

  • Firestone
  • Air Springs
  • Rear Axle Suspension Enhancement
  • 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


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.



W237604118 Firestone Coil Rite Air Bags - Rear Axle

Item # F4118

Installation Details F4118 Installation instructions

This Product Fits The Following Vehicles





Customer Reviews

Firestone Coil-Rite Air Helper Springs - Rear Axle - F4118

Average Customer Rating:  4.4 out of 5 stars   (243 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.

- F4118
by:
2015 Nissan Pathfinder

Good product. takes some effort getting the bag inside the coils. As far as removing the frame bumper - didn't do it - it is pressed in between the frame and top of coil spring. So far so good 514375



- F4118
by:
2016 Nissan Pathfinder

I got the a draw tite hitch, wiring harness and Firestone coil helpers for my 2016 Nissan pathfinder. Everything fit great and was easy to install. The price was awesome and shipping was super fast. An easy A+ for etrailer.com. 343985



- F4118
by:
2014 Nissan Pathfinder

Easy installation fixed my problem of low ride height. The only thing I would change is I wish there was a 90° angle for the bottom so it doesn't stick so far out I know it's going to end up catching things on the road 595108



- F4118
by:
2016 Nissan Pathfinder

I've installed the air springs and and they hold up great. I'm pulling a tall 5 x 10 enclosed trailer and no more sagging in the rear end. Air up the bags to 35 max PSI and the ride quality is excellent. 715974



- F4118
by:

We ordered a suspension kit it came right away and at a great price. We had checked out several shops in town who said they were hard to get for our new vehicle and the cost was out of this world. Great job guys 165779



- F4118
by:
2014 Nissan Pathfinder

Installation on 2014 Pathfinder didn't require Shock removal. It went in fairly easily. They are helpful although wonder if they shouldn't be slightly taller . With 5 passengers and trailer approx. 3500 lbs. still sags some. In my opinion Japanese cars all have Weak rear suspensions 139152


Comments
How did you install with the stop built into the top spring seat? Also did you run the air hose out the bottom? Thanks
-- comment by: Will - 08/13/2014

6226
Comments
To Will , To be honest, I didnt even look at the upper inside of the spring for a stop . I simply collapse the bags and worked them into the spring . Yes I have the air fitting and hose coming out of the bottom . I used extra cable ties to secure the hoses. I drilled NO holes in anything. I was carefully of routing the lines away from the heat of the exhaust. I mounted the Air fittings to the holes in the receiver. One complaint is that I have great difficulty in filling the them. I dont know if it is the Tire chuck I am using or the Fittings provided. I actually end up unscrewing the nut on the fitting and take the fitting and hose free from the receiver to press the tire chuck on far enough to fill them then remount the fittings to the receiver
-- comment by: Larry M - 09/30/2014

7059

Thanks for responding Larry. In the installation instructions Firestone recommends removing the factory jounce stop, or spring seat before installing the Air helper springs.

-- Rachael H - 10/1/2014


- F4118
by:
2010 Nissan Pathfinder

I received my order and installed the Air Helper Springs the next day. I had the opportunity to fully test them yesterday. They were not difficult to install and the instructions were easy to follow. I do wish there had been a video for my particular vehicle since I’m not exactly sure my routing of the air line around the exhaust the best location. Time will tell. After hooking up my trailer I adjusted the air, best I could, since all my tire gauges start at 10 lbs and go up from there. I did get the rear of the Pathfinder as level as I could. A recommendation from etrailer on a good digital or analog gauge would have also been helpful. I did pick up a digital gauge today, works great. Thanks etrailer for a great products, instructions and your follow up email that answered my questions, 513109


Comments
Excellent! I use it when I tow my equipment trailer and I haven’t had “any” problems. I did alter the hose configuration to a single point of air input instead of a valve for each bag. I know their reasoning but single input works better for me.
Kevin S - 05/26/2019

55749

- F4118
by:
2013 Nissan Pathfinder

The product came very soon after I ordered it and is just as what is pictured. While there are no instructions in the kit - I am a capable mechanic and do not need any. It was tough getting the bags into the springs of a 2013 Pathfinder. I relaxed the suspension as best I could, but the spaces in the coils are not large. It helped to insert the bags from the middle of each spring. The air lines are a combination of schrader valves both conventional and friction fit - take care to trim the friction fit square. I used a sharp knife. I had to fabricate a mount for the exterior valves and used a piece of 1/8 sheet aluminum. I noted the difficulty of routing the air lines away from the hot exhaust and over extension and flexion. On my vehicle the air line must extend from the bottom of the spring and this will, unfortunately increase the risk that the line will foul on a road hazard. Spend a few moments under your vehicle and route a path for the air lines before starting the install. Overall these bags seem to be a rugged option for a suspension boost. I will add to the review as time goes on if necessary. 295316



- F4118
by:
Nissan Pathfinder

Great support for suspension while pulling my boat with our pathfinder. Easy instal thanks to etrailers videos. 830414



- F4118
by:

Easy to install and improved the ride and enabled me to have a more level ride in my Pathfinder when towing a trailer 811817



- F4118
by:
2014 Nissan Pathfinder

I installed these on my 2014 Nissan Pathfinder, which despite being rated to tow 5,000lbs, really struggled under the tongue weight of my boat trailer. These airbags really made a difference when towing and only when speeding over speedbumps do I notice them in normal conditions. My only complaint is that the valve stem points down, which once hooked to the hose, sticks down nearly two inches and was routinely getting ripped off in the snow. I finally gave up the hose and just rolled under the car to increase the pressure (which I've only done once). The kit should really come with a 90* connector, but otherwise it works great. 497497



- F4118
by:
2013 Nissan Pathfinder

Still holding air after a year. Works well, I highly recommend. 425911



- F4118
by:

Yes, I did receive the shipment. It was exactly what I ordered and on time delivery. I really appreciate your help with all of the orders. Kevin, you and your company are to be congratulated! I'm sure I'll be contacting you with other orders. Thanks again!! 341578



- F4118
by:

These air bags definitely help with keeping the rear end higher than it would be (towing with a minivan, 300lb tongue weight), but as they are limited to 35psi, don't lift the rear as much as I would like. They are perfect for a full van by itself. Fairly easy install, only hard part is getting bags into coil spring. Air hose connections work very nicely. Used for 2 months and one 1000 mile towing trip so far. 20008



- F4124
by:

Review from a similar Coil-Rite in Vehicle Suspension


These air helper springs did exactly what we needed. We tow a Jayco Hummingbird trailer (3,750 lbs, 450-500 lb tongue weight) with our 2000 Toyota Landcruiser. Even with a weight distributing hitch the rear end squatted a bit more than I wanted. With the air helper springs installed rear end squat has been completely eliminated. Driving without the trailer feels more firm and connected to the road. The only negative is about the complexity of the installation. On the 2000 Landcruiser it requires that the rear suspension be partially disassembled. That was far more than I could handle at home. It took our neighborhood auto shop 3 hours to complete the job. Money well spent. 638942


Comments
It took some work by the shop, but it’s finally working as designed. The touting of the air hose from inside the coil spring is through an existing hole in the frame was binding and causing the driver side hose to become kinked. The shop had to enlarge the hole and one that was done there have been no more problems.
jmcdermo - 05/07/2020

75902

- F4170
by:

Review from a similar Coil-Rite in Vehicle Suspension


Product is what you see on the web page and the videos exclent its idiot prove 411973



- F4105
by:

Review from a similar Coil-Rite in Vehicle Suspension


Did not work at all on my 11altima. No change to the suspension and the bags deformed beyond recognition after 2 weeks 260702



- F4174
by:

Review from a similar Coil-Rite in Vehicle Suspension


Working out very well 735132



- F4175
by:

Review from a similar Coil-Rite in Vehicle Suspension


Product installed without any issues. Do suggest taking a paper towel or rag and spraying a small amount of WD40 on it and wiping around spring coils only not on air bag. Bags slide in a little easier. Would have been 5 Star except for unacceptable shipping time, 5 days to on instate location 200 miles away. 579207



- F4176
by:

Review from a similar Coil-Rite in Vehicle Suspension


Used the Air Helper Springs on a VW Jetta to help when we put the 4 bike rack on it. Worked perfectly, kept us level when loaded and letting the air out gave us the ride when empty. Bike pump easily pumped them up when needed. I would recommend this product for anyone needing to control ride height under load or when towing to stiffen the suspension. We have had them installed for over a year. Way to go eTrailer! 240426


Comments
Continues to work well. Would recommend without reservation
Tim F - 03/09/2017

22663

- F4174
by:

Review from a similar Coil-Rite in Vehicle Suspension


As a former mechanic, this was a tough install. It was a struggle to get the air bags through the springs and there was not enough room to remove the 3" piece of tubing so I installed the bag with the full length of tubing already in place. I was hoping to gain about a 2" lift, but it only raises the vehicle about 3/4 of an inch. The bags do make a noticeable difference in handling and the hitch is not so close to the ground while hauling a trailer. 103341



- F4124
by:

Review from a similar Coil-Rite in Vehicle Suspension


Review is for very helpful service- got into a time squeeze, made a call on Sunday, and received the correct part on Tuesday AM. No review on product yet, but it looks like it should work well. The go into the rear coils of a Toyota Sequioa and are currently being installed. 662780



- F4179
by:

Review from a similar Coil-Rite in Vehicle Suspension


I installed these on my 2006 Honda Odyssey to pull an 18ft (total length) popup camper. My van used to bounce pretty good through intersections and would occassionally bottom out on the big bumps. After putting these in, it rides nice and level, and hardly bounces at all, improving the ride for passengers and popup alike. One note, I had them installed at a local shop and he ran the airline so each stem comes out just in front of the rear wheels (through the bottom body panel) to avoid the exhause. 12359



- F4174
by:

Review from a similar Coil-Rite in Vehicle Suspension


Thanks to all of the folks who shared their observations on the installation of Firestone Air Helper Springs on Toyota RAV4s. Some of their suggestions made my life much easier. The Firestone instructions, as others observed, were pretty generic and were probably not written by a person who actually installed them on a RAV4. Here are a few things that I found useful: I found that the easiest way to cram the air bags into the coil springs was to flatten them like a pancake with the top and bottom surfaces collapsed onto each other and lash them in this state with a zip tie. Compressed this way you can push them thru the gap in the coil spring in the correct orientation so that when you release the zip tie they expand into the coil spring correctly. It helps to push them thru an opening just below the center of the coil spring so that the air bag ends up slightly below center touching the bottom plastic protective disk. It is really difficult to move the air bags up or down once they expand into the coil spring. I attached the air hose after the bag was in place. You can use a heat gun to warm the air hose enough to bend it so that it exits the lower control arm, turns 90 degrees, and runs along the back of the control arm without hanging down. As others noted the exhaust system presents special problems on the right side. I ended up routing the air line toward the brake and up to the upper control arm to stay away from the exhaust pipe. It's not clear what the best strategy is for routing the air lines. They seem pretty tough, but will likely be rubbing on something given all of the movement in the suspension. I'd suggest not cutting the air line and starting with the right side, which for me needed more air line length to keep away from the exhaust system. That way you will have enough air line to finish the right side and you can use the remainder on the left side, which will need less. I cut the line in half to begin with and barely had enough for the right side. All of the bits seem to be of high quality. The quick connect air fittings seem to seal well and grab tenaciously so you will have a very hard time removing them once you install them. Like a Chinese puzzle on steroids. Our trailer has around 440lb tongue weight and these have brought us back to level with a few psi to spare. We'll see how it goes over the road. Thanks to everyone who contributed ideas and suggestions. 161229



- F4155
by:

Review from a similar Coil-Rite in Vehicle Suspension


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


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Show More Reviews

Ask the Experts about this Firestone Vehicle Suspension

  • Air Bag Helper Springs for a 2015 Nissan Pathfinder Towing a Travel Trailer
    Suspension enhancement will help with the rear end squat on your 2015 Nissan Pathfinder. SUVs tend to have softer suspension compared to most trucks so even when using weight distribution some squat can still happen. For your Pathfinder # F4118 is the only option. When you are ready to start towing couple the trailer to the vehicle like normal. Then adjust the air springs as needed. I have included a link to the installation details for you.
    view full answer...
  • Suspension Enhancement for a 2020 Nissan Pathfinder
    The only suspension enhancement available for your 2020 Nissan Pathfinder is the Firestone Coil-Rite Air Helper Springs # F4118. These air bags install inside the coil springs on your Pathfinder and help to offer extra resistance for leveling and better control of the vehicle. I do recommend using the Bulldog Winch Portable Air Compressor # BDW41001 to inflate the air bags when needed. This compressor can easily plug into the 12V power outlet in the trunk of your Pathfinder and it includes...
    view full answer...
  • Are the Firestone Coil-Rite Air Helper Springs F4118 A Confirmed Fit for a 2016 Nissan Pathfinder
    The Firestone Coil-Rite Air Helper Springs part # F4118 is a confirmed fit for your 2016 Nissan Pathfinder and the only option of its kind that we have for you. The air bag works by expanding which then limits the amount that the coil springs can compress. This will then reduce sag once a heavy load is applied. In order to install them you basically fold the bag and then slip them though the space in the coils. The bag does not need to extend the length of the entire coil, there can be...
    view full answer...
  • Air Suspension for 2017 Nissan Pathfinder
    There is one rear suspension enhancement for your 2017 Nissan Pathfinder, the Firestone Coil-Rite Air Helper Springs # F4118. These springs can adjust from 5 to 35 psi and will help keep your Pathfinder level from exactly the amount that you haul, at least 500 lbs to no more than 1,000 lbs. For an onboard compressor you can use the Firestone Air Command II # F2178, which is a dual function compressor that allows you to inflate each of the springs individually to help level your ride....
    view full answer...
  • Firestone Coil-Rite Air Helper Springs Rear Axle for 2006 Infiniti FX35
    I looked over the instructions (see link) for the # F4118 Coil-Rite Air Spring Kit. The installation looks pretty simple and straightforward. If you do not feel comfortable completing the installation yourself, the installation is something that any mechanic should not have any problem completing. The vehicle is jacked up, and the frame supported by jack stands. Remove the rear wheels to allow easier access to the coil springs. The air bags are then compressed as described in the instructions...
    view full answer...
  • Will the Firestone Coil-Rite Air Helper Springs Withstand Extreme Cold Temperature
    I called my contact at Ride-Rite about the Firestone Coil-Rite Air Helper Springs part # F4118 for your 2017 Nissan Pathfinder and they informed me that you should have no problems with them in the extreme snowy/cold Virginia weather. The air springs are rated for use in weather as low as -40 degrees fahrenheit. It is imperative that you use an airline tubing cutter such as the Firestone Tubing Cutter part # F9009 to ensure a leak-free connection is made between the airline and fitting.
    view full answer...
  • Recommended Parts to Tow a Trailer with a 2015 Nissan Pathfinder
    You are definitely on the right track when it comes to everything you need for towing with your 2015 Nissan Pathfinder. The Firestone Coil-Rite Air Helper Springs # F4118 is a good idea to help with sag, but we always recommend using a weight distribution (WD) system for any trailer that weighs more than half of the curb weight (unloaded weight) of the tow vehicle. A WD system will help with sag because it distributes the total tongue weight (loaded tongue weight of the trailer and...
    view full answer...
  • Is Hose Kit for Firestone Coil-Rite Air Helper Springs # F4118 Necessary for Filling Bags
    You will definitely want to install the included air hose kit with the Firestone Coil-Rite Air Helper Springs # F4118, as there likely won't be enough room to add air directly to the fittings on the bags, especially if the vehicle is loaded with any kind of cargo. The kit does come with nylon ties to secure the tubing at various points under the vehicle to help bring up any slack. This will prevent them from getting caught on anything or being torn off by snow like what you mentioned....
    view full answer...
  • Should Additional Transmission Cooler be Used When Towing at Max Capacity with 2014 Pathfinder
    If you are planning on maxing out the 5,000 lb towing capacity of your 2014 Nissan Pathfinder then yes, it would be wise to install a supplemental transmission cooler like the Derale Series 8000 Plate-Fin Transmission Cooler Kit # D13502. Since you will really be pushing your transmission to its limits this additional cooler will help to reduce some of the heat stress, but towing at max capacity will still be pretty rough on your vehicle. I also recommend using the Equal-i-zer Weight...
    view full answer...
  • Is Aftermarket Trailer Hitch Safe to Use Over OEM Trailer Hitch for a 2017 Nissan Pathfinder
    Yes, even though the Draw-Tite Max-Frame Trailer Hitch Receiver # 76031 only uses 6 bolts as opposed to the 10 bolts for the OEM trailer hitch it has gone through an extensive amount of stress tests to ensure that the 6,000 lb trailer towing rating is completely safe. I highly recommend going with this over the OEM for your 2017 Nissan Pathfinder so that you can add some extra components. For a cost-effective brake controller that is reliable I recommend the Tekonsha Primus IQ # TK90160....
    view full answer...
  • Suspension Enhancement Recommendation for 2015 Nissan Pathfinder
    We have suspension enhancement that is a fit for your 2015 Nissan Pathfinder but it's not the SumoSprings that you referenced. Instead you'd want the Firestone kit part # F4118 which is a confirmed fit.
    view full answer...
  • Helper Spring Option for 1998 Toyota Sienna
    We do have a suspension enhancement solution that will work with your 1998 Toyota Sienna. I'd recommend the Firestone Coil Rite Air Helper Springs, part # F4118. The nice thing about an air system is you can tailor the firmness of the suspension to fit what you're carrying or towing. The air pressure can be adjusted from as little as 5 psi all the way up to 35 psi. Timbren doesn't offer a solution for your vehicle, but in all honesty the Air Bag solution would be a better option because...
    view full answer...
  • Weight Distribution Compatibility with a 2005 Nissan Murano Class III Trailer Hitch
    If your 2005 Nissan Murano came with a factory installed Class III trailer hitch, then your owners manual should tell you if a weight distribution system can be used or not. I can tell you that a weight distribution system cannot be used with any of the Class III trailer hitches that we offer for your vehicle. Your travel trailer is fairly light, but if your vehicle sags a lot when towing your trailer, then you could look into the Firestone Coil-Rite Air Helper Springs, # F4118. These...
    view full answer...

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Info for this part was:

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Updated by:
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Updated by:
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Updated by:
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Expert Research:
Mike L
Expert Research:
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Written by:
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Video Edited:
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