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Firestone Coil-Rite Air Helper Springs - Rear Axle

Firestone Coil-Rite Air Helper Springs - Rear Axle

Item # F4157
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Firestone Rear Axle Suspension Enhancement - F4157
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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 F4157 can be ordered online at etrailer.com or call 1-833-496-1390 for expert service.
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Firestone Vehicle Suspension - F4157

  • 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


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.



W237604157 Firestone Coil Rite Air Bags - Suspension Kit - Rear Axle

Firestone 4157

Installation Details F4157 Installation instructions

This Product Fits The Following Vehicles





Customer Reviews

Firestone Coil-Rite Air Helper Springs - Rear Axle - F4157

Average Customer Rating:  4.5 out of 5 stars   (420 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:
2005 Jeep Grand Cherokee

Instructions are weak. They do not explain how to get the "jounce" bumpers out of the coil springs. Secondly, I cannot locate the air leak, but figure it must be on top of one of the air bags and that the jounce mount might be hitting the elbow for the air line.
Not a very good design.


Comments
My 2008 Grand Jeep Cherokee Overland has those yellow things jounce bumpers inside the coil also. Do those need to come out? Is it ok then that the bag doesnt fully occupy the space vertically?
-- comment by: Michael B - 11/27/2013



by:
Jeep Grand Cherokee

A specialty tool I needed to put the air bags on my Grand Cherokee was a coil spring compressor. Straight forward install. Vehicle now rides much better when pulling a 4500lb trailer.




by:
2005 Jeep Grand Cherokee

Picture of the spring helper. Air line really needs to be on the side if possible.




by:
2010 Jeep Grand Cherokee

Pretty easy install and product works great. Pulling our 22 ft crownline with our 2010 jeep grand Cherokee is much better all around.




by:

Review from a similar Coil-Rite in Vehicle Suspension


Installed on my 2020 Ram 1500 4x4 ecodiesel. Took about 1 hour. Jacked up rear of vehicle to let coil spread out a little. Bags went in easy. Air lines were simple to run. Bought the union T-valve so I could air the bags up at same time and to make sure equal PSI goes to each bag.


Comments
They still working great. Only minor issue is the line that threads onto bags do come lose and cause air leakage. Recommend locktite to solve the issue.
John - 03/14/2022


by:

Review from a similar Coil-Rite in Vehicle Suspension


They functioned exactly as advertised. Very strong and durable. So strong are they that they didn’t even burst or puncture in a roll over crash. One of the spring that contained a spring assist bag was knocked out of the truck and it still did not rupture.
In the pictures below you can see the spring in the bed of the truck.
Highly recommend this product.




by:

Review from a similar Coil-Rite in Vehicle Suspension


Installed on my '08 Acura MDX, very tight fit, it would work perfectly if air didn't leak out of the connection at the bottom of the bag.
It was a very lengthy install process for me, about 6hrs due to a stuck rear strut bolt that required drilling out. Also, needed an additional person to re-install the coil while holding down the lower control arm and squeezing the coil back into position.
The air leak is easily identified where the air line connects into the bottom of the airbag. I've re-cut the airline multiple times to ensure a perfectly flat end of the tube, and re-connected it. Even had a mechanic check the system, but there's still a slow leak at the connection into the bag.
These airbags seem very sturdy, but this is starting to make me second guess the quality, it seems like that connection is a clear weak point/design flaw.


Comments
Customer Service will reach out to you about the warranty.
-- Etrailer Expert Sierra K - 01/18/2022


by:

Review from a similar Coil-Rite in Vehicle Suspension


No issue at all with these. Keep them with at least 10-15psi at all times and lift it up to 30psi only when fully loaded or hauling. Initially, the blue fill tube seemed too long but worked out great to get it laced underneath the exhaust heat shield. Some have put the fill valves on the inside. However, I found it easier to use a standard bike pump on the exterior. And made it symetrical :)
I would had have recommended it to several others who have simular needs.




by:

Review from a similar Coil-Rite in Vehicle Suspension


They work great. First I added a levelling kit then the Firestone ride rite for when I tow my boat. Really notice the difference when towing.

With fully loaded tongue weight, rear suspension dropped .75 inches, added 10psi to the bags and brought it back up .5 inches.


Comments
Its been great one of the best additions to use when towing. I recommend it for anyone that tows or adds excessive weight in the rear.
Chris K - 11/12/2021


by:

Review from a similar Coil-Rite in Vehicle Suspension


This is the worst product I have ever experienced.. both in terms of installation and use. I was very excited upon receiving the product and couldn't wait to install as my SantaFe was suffering from the rear end squat upon loading up for a trip.

Before installing I gave the product a test fit to see how it would perform and here I found the first problems. The air hose wire as well as the bags were super stiff... which I later learned was going to have a major effect on the installed product. I hooked up the L-shaped connectors to the bag and upon trying to test the system for leaks I found that I wasn't able to put any any air inside. After further investigation it appeared as though the L-shaped connector wasn't reaching the air valve to depress it to allow air to enter or exit upon tightening the connectors on the valve stem of the air bags. OK not a super big deal.. I got rid of the valves in the airbag as the only valves that really mattered were the valves on the end of the line where I would fil up the system air near the bumper.
Upon installing the system onto my car which was a process that took many hours, I quickly realized that the system wont last for too long. The who system is not stable inside the shock.. the pillow moves around as the shock experiences vibration as it travels down the road. Also the L-shaped connectors barely clear the black puck like discs and its very hard to tighten them down on to the air bag. Also on installation there isn't enough room in the cavity for the wire to come out properly to the hole that was drilled causing it to either wrap in a spiral or it creates a kink in the line causing the line to crack over time as the L-shape connector creates a 90 degree angle... I have now idea who designed it this way..why not use a straight up connector and softer air lines.
After the install the lines lasted maybe 2 weeks before the system went total flat. Upon looking at it both sides had their lines crushed and cut allowing air to escape. One side had an air leak right by the L-shaped connector (in the hose) and the other side developed a leak in the hose near where the drilled hole was the hole was too small to give the super stiff hose enough clearance to freely move as the air bag was moving up and down with the suspension spring as the car was being used. The holes were drilled to spec.

I tried fixing the system 2 times following the initial install but similar problems continued. I enlarged the holes and changed the lines to clear flexible tubbing, and tossing out the L-shaped connector. I had minor success but the tubing eventually comes loose or gets worn out. The biggest problem is that the black puck should be attached to the bottom of the suspension cavity and the air bag to it... but without being able to find the proper inline screw on cap connector I resulted to attaching the clear tubing to the treads of the air pillow with crazy glue and Teflon tape. Part of the problem is that the whole assembly air bag and black puck just kind of float in the
inside the spring of the suspension and are in constant movement up and down as the bag itself once inflated travels up and down as the spring gets compressed. It appears the air hose also serves to keep the who system in line which it does not. Eventually small leaks develop and the system gets flat. I have wasted too much time on this but I will try to fix it again this summer for the last time. Hope this helps someone out.. I have had terrible experience with this. cheers


Comments
The installation of this kit is a more involved installation. I would not recommend removing the valves in the air bags though I understand that it worked in the short term. I recommend watching the video installation that we completed on a 2015 Hyundai Santa Fe.
-- Etrailer Expert Jenny N - 03/21/2022


by:

Review from a similar Coil-Rite in Vehicle Suspension


I added these to my Trailblazer ext after I lowered it 2/4. I pull a 25ft pontoon and a heavy duty equipment trailer that weighs 2500lb empty and I've never rubbed and it keeps the bounce to a minimum. Installation was easy.




by:

Review from a similar Coil-Rite in Vehicle Suspension


The Air Helpers are a real bear to install, took me 5 hours and lots of ingenuity but it's done now.. They are a very dense, thick, flexible material that are extremely stiff and don't go easily (a huge understatement) between the coils to lodge inside the springs. They are quite low volume so be careful to inflate small amounts at at time until you reach the desired pressure. Haven't had them under a load yet, but if you manage to get them in place I expect they will provide stiffening as advertised.


Comments
Not really helping, and theres a slow leak in one of the systems.
LED - 04/17/2022


by:

Review from a similar Coil-Rite in Vehicle Suspension


Installed on a 2016 4Runner in conjunction with a 1-1/2" Daystar coil spring spacer. Since the coil spacer is hollow, I left one segment of the factory bump stop in place to compensate for and match the height of the spacer. I also added a Firestone T-fitting on the airline for a single inflation point and located the inflation valve next to my trailer plug wiring. Quite a pain to wrestle the coil back in place with the added height of the spacer, but that is no fault of the airbags; pry bar proved critical to wedge the coil back in place since I did not try the bottle jack between the frame and axle trick. After nearly a year, no leaks, bags hold air well. I put 25 psi in them for towing our travel trailer, or keep them at 10 psi for normal running around. I have also found them useful to prevent or at least reduce bottoming out the soft rear suspension that happens when off road driving with even just a couple hundred pounds in the back. Even at 25 psi they ride great and you wouldn't know they are back there at 10 psi. Highly recommend for the low cost and added versatility!


Comments
Still working great after a year. Knock on wood... no leaks to date. I would consider these essential equipment for towing, and would highly recommend for heavily loaded backcountry travels as well. I did try them near their max pressure on one trip with 5 people, roof top tent, and gear for a week of camping this summer and it was too much and felt very unsafe ped the pressure back to sub-30 psi after driving a few blocks and all was great after that!
Off2Mtns - 12/14/2018


by: 05/31/2021

Review from a similar Coil-Rite in Vehicle Suspension


Is a great idea but awful material !! I think that if the quality of material is higher, this would be worth it !!
I ordered a kit and I have a professional Install it. within an hour the air was all out !!! I took back and Found that the connections were leaking . So we replace them and next day. no air (again) in the air suspensions . Found out that the air spring is defective. Is not easy to install and is harder to get it fix ,if leaks . I don’t recommend this product unless is a higher quality!! Other wise is a headache




by:

Review from a similar Coil-Rite in Vehicle Suspension


Easy install in less than 2 hours. I disconnected the shock absorber on one side to get a little more room, but I was still able to slip the bags in on the side I didn't disconnect. On my atlas cross sport, there was a plastic plug at the bottom of the coil in the lower control arm that needed to be removed.




by:

Review from a similar Coil-Rite in Vehicle Suspension


Install was easy on 2014 FJ Cruiser...pulled the wheels off, jacked it up a bit, and the axle dropped enough to allow room to fit the bags inside the springs. I will see how they perform when I hook up my trailer but they inflate quickly and I can see these will stop my vehicle from squatting when the cargo area and trailer are heavily loaded. Another excellent product offered by etrailer...thanks.


Comments
After a year of regular use, these bags have been great. They keep my FJ level when towing and as a result steering while towing is vastly better.
Ryan G - 05/23/2018


by:

Review from a similar Coil-Rite in Vehicle Suspension


Great product and works perfect on my Jeep Gladiator. The instaletion video was nice to watch although is very much the harder way to install the air bags. Much easier to remove the outer sway bar bolts and the shoch bolts, raise the frame and drop the bag down through the top of the removed spring. Just be sure to align the factory top spring pad correctly when raising the axle back in place. This also made it a lot easier to install the air line. It took me about one hour this way for the complete job and never folded the bag to force it through the spring.




by:

Review from a similar Coil-Rite in Vehicle Suspension


Installed on the rear coils of a 2008 Nissan Armada after removing factory air shocks and installed a 2" lift. Easy installation and works perfect for my needs. Only suggestion would be to add a "T" to the kit so you can inflate at one point versus two.


Comments
Ryan, are these still working well and how much do you haulwith how much tongue weight. Thank you.
-- comment by: Brent S - 02/09/2016


by:

Review from a similar Coil-Rite in Vehicle Suspension


These air bags are amazing! I have a 20' boat and hitch box I often use. The ride was horrible in my Armada when loaded down, but the air bags made a tremendous difference. The ride is smooth with no more bouncing around or bottoming out and the steering and handling are greatly improved. Installation was simple and took less than an hour for a guy who's not so mechanically inclined. When installing, use zip ties to keep bags compressed and then clip the zip ties once the bags are in the springs.




by:

Review from a similar Coil-Rite in Vehicle Suspension


So far it’s holding air, but still new; cannot comment yet on durability over a hot summer of towing. Took my Toyota dealer mechanic about 2 hours total with a few interruptions to install. Appears to be a good install on our 2022 Toyota Sequoia TRD Sport. Decided to keep the 2 valves separate for now and not merge 2-into-1 until I see how the suspension behaves with towing. Our 21’11” GD XLS 17MKE probably has a ‘dry’ weight (2 propane bottles, 2 6-volt batts, 1 rooftop solar panel, 1 controller) of about 4800 lbs, and about 5600-5800 wet (water tank not full). My Sequoia weighs right at 6000 lbs.
Driving around with just the Sequoia and no cargo..our mechanic had put 12 psi in the airbags. I was sure I could feel it modestly on the 1:15 drive home, but not severe or anything. Using an accurate low pressure gauge (like that for ATV/UTV tires) I lowered the bags to 9 psi, and drove 4 hrs yesterday (again the truck empty) with highway speeds; I could feel the improvement, it was close to normal. I will try 8 psi this week. Likely will stay at that for day to day driving. Instructions say to always keep 5 psi or more in the bags.
If this website allows for updates..I will once I have towed my loaded trailer at a few different air pressures settings.




by:

Review from a similar Coil-Rite in Vehicle Suspension


We have a Nissan Pathfinder that is more than capable of handling the tow weight of our boat and trailer, but the suspension is definitely designed for a smooth ride over towing, so hooking up the boat left us with a definite dip in the back. These air helper springs did the trick and were so much easier and less expensive than replacing the suspension!! They made towing the 21 foot boat with trailer much easier and safer.




by:

Review from a similar Coil-Rite in Vehicle Suspension


First try at installation did not go well. Put everything up and tried again next day after watching a few online videos. Much better success. Main thing was the instructions did not mention taking the rear wheels off. Once I did that, everything went more smoothly.




by:

Review from a similar Coil-Rite in Vehicle Suspension


Best $xx.xx I’ve yet spent on trailer towing. They are so great for leveling off vehicle when towing. And they adjust easily for different trailers/tongue weights. Make a “load” of difference and way cheaper / easier than a weight distribution hitch. I installed these myself on a 4Runner, in my garage with two jack stands and a floor jack. Video was great and everything went just as shown in the video. Only difference was that my vehicle has KDSS suspension. Need to tie kdss rod cylinders with zip ties to hold same length when bottom bolts disconnected. Keeps it from needing rebalancing.




by:

Review from a similar Coil-Rite in Vehicle Suspension


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:

Review from a similar Coil-Rite in Vehicle Suspension


Struggled for over an hour trying to get one bladder in without dismantling any part of the suspension, but was unsuccessful. Leaks seem common with this product, so I decided it wasn’t worth the effort. Interesting how the installation video cuts to the bladder inside the coil without showing how they actually installed it.


Comments
I recommend watching the video that we have on a 2018 Toyota Rav 4 starting at mark 8:20 to see how we installed the spring into the coil. If the air springs are leaking then we suggest spraying 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 airline s into a fitting. If the airline wasnt cut perfectly square it will end up leaking. I would check there first.
-- Etrailer Expert Jenny N - 12/29/2021

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See what our Experts say about this Firestone Vehicle Suspension



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    The Firestone Coil-Rite Rear Axle Air Helper Springs, part # F4157, are intended for use with the stock suspension components in the 2006 Wrangler Unlimited. I called my contact at Firestone and he confirmed that these air springs are not compatible with your aftermarket suspension kit. I have included the installation instructions for this product just in case you do wish to review them. I checked for helper spring kits from other manufacturers such as Timbren and Super Springs that...
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