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  1. Vehicle Suspension
  2. Firestone
  3. Air Springs
  4. Rear Axle Suspension Enhancement
  5. Light Duty
THIS ITEM IS NOT A FIT FOR
2016 Honda Pilot

Firestone Coil-Rite Air Helper Springs - Rear Axle

Item # F4138
Our Price: $123.94
Vehicle Suspension
Not Confirmed to Fit

2016 Honda Pilot

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Shipping Weight: 2 lbs
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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 Honda Pilot, 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 F4138 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Honda Pilot - Firestone Coil-Rite Air Helper Springs - Rear Axle

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

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 Honda Pilot, 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.



W237604138 Firestone Coil Rite Air Bags - Suspension Kit - Rear Axle

4138

Installation Details F4138 Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Firestone Coil-Rite Air Helper Springs - Rear Axle - F4138

Average Customer Rating:  4.4 out of 5 stars   (628 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.

by:
2015 Honda Odyssey

I have a 2003 Acura MDX with 197k miles on it. I have used it for towing a 6x12 trailer for 3 quads. I have also towed many loads of dirt, mulch you name it. The rear sags allot and I just bought a 19' boat. I found this kit on etrailer and ordered it. The box came and it said it was for a Honda Odyssey. I double checked online with various sites and confirmed that all Acura MDX, Honda Pilot, Honda Odyssey, & Honda Ridgeline all have the same coil spring suspension with bumper stops inside the coil. I found a great forum which included pics of someone else that installed similar kit. I used those as references to install mine. Here are the steps to install which took about 2 hours:
1) Jackup car, and suppored with good jack stands
2) Removed tires
3) Using a 7/8" hole saw and made a hole in the middle of the lower control arm.
4) Filed the burrs
5) Installed a 7/8" grommet (not included in kit, I got this a local ACE hardware store)
6) Removed bolt from lower control arm knuckle to lower the arm.
7) The bolt for the bumper stop is not accessible, so I used a hand saw and cut about 2" of the rubber stop out.
8) Compressed the air bag and installed the plug (supplied) to keep it compressed, inserted the airbag thru the coil.
9) I deviated from the instructions which says to use the included plate at the top of the airbag which requires removing the bumperstop. Instead I placed this at the bottom of the airbag, which nicely has a grove in the middle which allows the connection for the airtube to sit in and keep it protected.
10) I routed the airline thru the factory openings in the lower control arm & rear end and up thru the trailer harness opening into the rear compartment in the trunk where the head rests go for the third row.
11) Reattached the lower control arm
12) Install tires
13) Lowered car
14) Inflated the bags to 15 psi which returned the truck to just a little above the stock height.

I must say this is exactly what I was looking for. I towed the boat this weekend and didn't sag at all, the ride was much smoother then ever. Even with nothing attached to the truck, the ride is much better. My opinion is that this should be installed for anyone that uses the third row seat, or tows anything at all Acura MDX, Honda Pilot, Honda Odyssey, & Honda Ridgeline as it eliminates the typical rear sag!



by:

The instruction video showed exactly how to install these. Just disconnected rear lower suspension arms and drilled holes for the air lines. Swapped in the top plates for the air bags and put everything back together. They work great. We top them off every couple weeks, but really only necessary to top them off when we are going on trip or towing something. Hitch doesn’t scrape any more and body roll is reduced. Great investment. Highly recommend.



by:

The gabs arrived with a leak in one and it took over 12 months to get a replacement from Firestone .. which also leaked. eTrailer was no help in resolving the problem - they just redirected me to Firestone and the unmotivated and poorly organized staff there. If yo buy these, get them at [online]- that company stands behind the product they sell.

Etrailer Expert

Jenny N.

12/6/2022

It is very unusual to have two air bags that would be defective from Firestone. Typically what can happen is the air line hose is not cleanly cut or is cut at an angle which can cause leaks over time. I recommend checking the hose and using a hose cutter like part # AL10530 to ensure clean cuts. I also advise using the soapy water method to locate any leaks. You can just spray soapy water on the air hose lines and see see if any bubbles form. If they do then you will know where the leak is coming from.



by:
2014 Kia Sedona

Maybe excellent after I try to fix it. Seems the driver side wont hold air too long. I just need it when I pull my Casita camper with my KIA Sedona and I just add air before I start out. Not too annoying really. Fixing it may be a little more difficult then living with it. But I think it was a good idea to buy and install.

Etrailer Expert

Mike L.

4/13/2019

The vast majority of the time, leaks will occur where the tubing enters the spring. If the tubing is not cut at a perfect 90° angle, its going to leak. You can test this by pressuring up the system and painting a solution of dishwashing liquid and water at the point where the tubing enters the fitting. If theres bubbles, theres your leak.



by:

Most challenging to install. Not snap fit. Removal of several components and careful routing of delicate air line also had to purchase grommets for holes where chaffing of air line would occur. Don't expect longevity. Suggest development of a single support spring assembly to be better engineered and increase longevity, reliability, and ride stabilization as well as load capacity. Rusted parts don't disassemble with out heat and air tools. New bolts washers and nuts should be included. Thank you



by:

Idk how well they work they haven't been right since first hooked them up. Was in contact with customer service and my busy schedule i didn't get to reply quickly. But I was told it was something I messed up so I've never had these working. One side would hold air for a day at most other never did.

Etrailer Expert

Jenny N.

12/28/2021

I will have our customer service team reach out to you. I recommend using the soapy water technique to see where it may be leaking. If you spray the air lines with soapy water typically you can see where the air is bubbling and what is causing the leak. Most of the time leaks are at where the air line s into a fitting. If the air line was not cut perfectly square it will end up leaking. I would check there first.



by:
2004 Honda Odyssey

Kit has made the ride in my Honda Odyssey overall better. Also keeps the back end from sagging to far when I've got the trailer on.

Quality parts (stainless steel valves and valve caps) easy instructions and it fits perfect.

Only drawback was that I had to have my mechanic install it, but after talking with him he said that it would have been a challenge without a lift.



by:
2016 Kia Sedona

Love the product! Holds my Sedona level, even with all the kids plus a load in the rear. Evens out the ride driving over bumps. Great for towing a trailer. Only down side was installation. I had the product installed by the Kia dealer as I figured it would be easy for them; it took the professionals 4 hrs to install. Outside of the cost for installation, great value for the money. Highly recommend!



by:
2016 Kia Sedona

Installed easily on my 2016 Sedona. I am pulling a pop up camper and this helped keep it level without adding stiffness to the van suspension. I only wish the tube didn't hang down below the suspension,



by:

Easy installation, has worked as advertised on my Kia Sedona van. I carry heavy equipment and inventory for my mobile embroidery business and it definitely helps with leveling and stabilizing the load.



by:
Kia Sedona

Great product for Kia Sedona 2012
Towing
my boat was heavy on car’s rear suspention. These airhelpers are great
Easy to install



by:

So far so good, It's been installed for a month, carries the wheel chair with little or no
dropping of the rear end.



by:

Firestone Coil-Rite still doing great.



by:

All went well I was informed when there was a delay.



by:

Have not installed it yet but I will follow up when it is installed. Great ordering experience and all was as described on website.



by:



by:

After installation we are towing on the level and enjoying the ride. In an effort to maintain the minimum air pressure to each Coil-Rite Helper at all times, we installed individual air supplies to each Helper. We used our onboard Horn-Blaster air compressor to supply two air pressure regulators allowing us to easily change air pressure to each individual helper as desired. Each regulator employs a check-valve to maintain pressure to the Helpers in case of a compressor failure. We have marked each pressure gauge to the minimum pressure and another mark for our desired towing pressure.



by:

The Firestone airbags are very well made and has quality feel. It was not very warm in MN when I installed them so I needed to use lubrication and a heat gun to warm the airbags from a distance so the airbags would be pliable. My gladiator has a Decked drawer system and rear steel bumper installed which caused the rear to squat more than the front. After installing these airbags and learning that I was fluent in “FRENCH” the rear of the truck was raised and squatting issues addressed. The drive was improved as well, less body roll around curves.



by:

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.



by:

As most have indicated fitting the bags in the springs is the hardest part. one tip I found helpful was once the bag was partially in, force the bottom of the bag with the air tube into the center of the spring then slowly let the air go back into the bag. Once it had some air in it i was able to move it around and get into place. once installed at 20 psi it raised my back end two inched. from 35" to 37" It is now level with the front of the vehicle. my vehicle is a 2015 armada platinum. Yes it has the auto leveling system. But the system wasn't functional. I've used these before in a 2010 armada platinum and it worked out great



by:

Great product. I must say that they were a little tough to install. A very tight fit. Fortunately for me I had the availability of a vacuum pump. With that I was able to evacuate all the air out of the bags which made them flatter, with that, it made it easier to slide them between the coil springs. I tow a small camper trailer, I usually run around 20 psi in the bags. This keeps my vehicle level and adds for a smooth ride. A great product.



by:

I can only give this 3 stars because one of the bags only holds air for about 1-2 days. The other bag stays filled for months. When they are both filled it gives my Pathfinder about 1" of extra lift while towing our travel trailer. So, the trip to the campground is fine but then I have to find an air pump for the trip home or tow with it lower. If they would both stay filled I would give them a 5 star rating. I contacted etrailer support and was told that I had to contact Firestone for warranty support. I have emailed (can't find a phone number on their web site) them twice with no reply.



by:

These things are awesome. Install was a bit tricky with actually getting them inside the spring. Defintely don’t attempt during the colder season as the material is NOT pliable. A bit of soapy water helps if the springs uncompressed still aren’t wide enough to easily work them in. They’ve held up great and provide a decent ride when the vehicle is loaded down. Minimal squat!



by:

I'll preface with I am an average do it yourselfer. I tried I stalling them on my VW Atlas for almost 3 hours before I just quit. I had to have them professionally installed. The installers said it took two of their people trying to fit the air rites in each spring. After installation they have been fine. My vehicle drops a little when I hook up boat but not a problematic amount. They hold air for quite a while and have not made any noise while traveling. They work as should. Just be prepared to pay for an install in event you cannot get them in.



by:

The bags seem too short for my 2011 Yukon. The bags increase the spring rate but don't provide any lift to level the truck out. The air hose also keeps coming out of the bottom of the bag, I'm not sure if that is also because they are too short. I've tried to keep the min 5psi in the bags when not towing but the hose just pops out and leaks the air out anyway. My best guess is the wrong part number is listed for my vehicle. Pretty disappointed overall.


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628
Show More Reviews

See what our Experts say about this Firestone Vehicle Suspension

  • Rear Air Bag Suspension Setup For 2015 Kia Sedona To Reduce Vehicle Sag
    The only rear suspension enhancement system that is confirmed to fit your 2015 Kia Sedona is the Firestone Coil-Rite Air Helper Springs - Rear Axle # F4138. This air bag setup has a weight capacity of 1000lbs which should be more than enough for your vehicle. It will drastically reduce rear-end sag on your Sedona as well as improve handling and reduce body roll on turns. While this kit includes everything necessary for installation and use, you may find it useful to add a compressor kit...
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  • Parts Needed to Safely Tow a Pop Up Camper with a 2016 Kia Sedona
    1. Normally I'd say that your 2016 Kia Sedona would be just fine as long as the pop up has brakes, but since your towing capacity without brakes is only 1,000 lbs it would be a good idea to install one. As far as the warranty is concerned you are protected by the Federal Magnuson-Moss Warranty Act. The Act states that if something breaks on your vehicle and you take it in for warranty repair, the dealer must honor your warranty unless whatever modifications you have added to your vehicle...
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  • Suspension Enhancement for 2016 Kia Sedona
    eTrailer.com does not manufacture air bags, but we do offer suspension enhancement air springs for your 2016 Kia Sedona. Firestone's Coil-Rite Airs Helper Springs, # F4138, are the only enhancement we currently offer that is a fit for your vehicle, but they are a custom fit. This system utilizes compressed air to partner with your vehicle's rear suspension. The air springs fit inside the metal coil springs already on your 2016 Kia Sedona to help with a number of issues, like sagging,...
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  • Suspension Enhancement Options for Towing With 2004 Acura MDX
    The Firestone # F4138 and # W237604138 are the same part. 4138 is the part number, and W237604138 is the SKU number that Firestone uses internally. Both the # F4138 and the Timbren # THROD2 are compatible with MDX models that have the coil spring rear suspensions only. It will not work on models equipped with the Coil-Over-Strut suspension. The Timbren springs will suspend up to 2000 lbs loaded in your MDX, while the Firestone Air Suspension is good for up to 1000 lbs. Neither system...
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  • What can I do to Level My 2008 Kia Sedona when Towing a Trailer
    What year is your Kia Sedona?
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  • Installing Firestone Coil Rite Air Helper Springs # F4138 on 2010 Kia Sedona
    The Firestone Coil-Rite Air Helper Springs, part # F4138 will install so that they sit inside the coil springs of your suspension on your Sedona. To install the springs, the lower control arm will be unbolted from the knuckle, allowing it to drop free and the coil spring to be removed so that the air spring can be inserted. You can see the full installation instructions by clicking on the link I provided. When installing the springs, cutting the air line perfectly square is crucial for...
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  • Installation of Firestone Coil-Rite Air Helper Springs Part # F4138 on 2007 Hyundai Entourage
    According to our friends at Firestone, drilling the hole in the control arm will not weaken or otherwise damage the vehicle. The hole is absolutely necessary to provide access for the air line to connect to the bottom of the Coil Rite air spring.
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  • Will The Firestone Coil-Rite Air Helper Springs # F4138 Fit a 2017 Kia Sedona
    Doing a parts search I do see the same rear coil springs were used on the 2015-2018 Kia Sedona. Unless there is something added inside your coil springs that would prevent the Firestone Coil-Rite Air Helper Springs # F4138 I do not see why they wouldn't fit. I have also linked an installation video near the bottom of the page you can reference to determine if there are any other differences with your rear suspension. Firestone would not tell me the dimensions of the bag itself. If there...
    view full answer...
  • Installing Firestone Coil-Rite Air helper Springs On 2000 Honda Odyssey
    Per the installation instructions for the Firestone Coil-Rite Air Helper Springs, part # F4138, the overload bumper inside the coil spring will need to be unbolted and removed. You will also need to drill a hole in the lower control arm when installing this system. I have attached the installation instructions for this system you can check out. Installing a system like the Firestone Air Springs will not increase the vehicle weight carrying capacity.
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  • Can a 2015 Kia Sedona Safely Tow a 3,700 Pound Jayco Travel Trailer
    What I recommend is a trailer that has a gross trailer weight that meets or is under the towing capacity of your 2015 Kia Sedona which is 3,500 pounds as long as the trailer has brakes. You can tow a trailer rated higher provided that the actual weight of the trailer does not exceed that 3,500 pound tow vehicle capacity. So they aren't lying about that but you do run the risk of overloading the tow vehicle by going with a heavier trailer. You will likely need suspension enhancement when...
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  • Comparing the Reese Light Duty Weight Distribution System to the Pro Series RB2 for a 2700lb trailer
    When choosing a weight distribution system, the most important factor to consider is the fully loaded and ready to tow tongue weight of your trailer plus the weight of any cargo behind the rear axle of your 2004 Honda Odyssey. Tongue weight of a trailer is typically calculated to be 10 to 15 percent of the gross trailer weight. If your Scamp trailer weighs 2,700 lbs, then the tongue weight may be around 270 lbs to 405 lbs. You must then add the weight of the cargo that you load in the back...
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  • How to Check for Air Leaks on a Firestone Coil-Rite System with Inaccessible Inflation Valve
    That is an excellent point. Firestone was recently here for training and they did address the issues installers have had with the instructions. Basically they are going to be redesigning all the instructions. But for you, you can check for leaks at every other place that you can (without disassembling the vehicle). Assuming everywhere else checks out then if there is a leak the only remaining place it could be would be the one place you can't get to unless you pull that control arm back down.
    view full answer...
  • How to Get the Rear Spring off the Spring Perch on a 2010 Kia Sedona
    A long screw driver or pry bar should do that trick. I had a similar situation with my car and was able to pry the last bit of the spring off the perch by using a pry bar in one hand and a long slot screwdriver in the other. I pried up with the pry bar and then to the side with the screwdriver to help slide it off the perch. Be careful and take your time. To get it back on you will just need to reverse the process. Leverage is your friend, use the pry bar to compress the spring and the...
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Info for this part was:

Employee Leah B
Updated by:
Leah B
Employee Mary K
Updated by:
Mary K
Employee Wilson B
Updated by:
Wilson B
Employee Daron K
Updated by:
Daron K
Employee Alex H
Updated by:
Alex H
Employee Mike L
Expert Research:
Mike L
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Tyler C
Written by:
Tyler C
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Nicholas E
Test Fit:
Nicholas E
Employee Alan C
Video by:
Alan C
Employee Jonathan Y
Video by:
Jonathan Y
Employee Robert C
Installed by:
Robert C

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