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Firestone Coil-Rite Air Helper Springs - Rear Axle

Firestone Coil-Rite Air Helper Springs - Rear Axle

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Firestone Coil-Rite Air Helper Springs - Rear Axle Air Springs F4155
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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 F4155 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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Firestone Vehicle Suspension

  • 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.



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

Firestone 4155

Item # F4155

Installation Details F4155 Installation instructions

This Product Fits The Following Vehicles





Customer Reviews

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

Average Customer Rating:  4.4 out of 5 stars   (396 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.

- F4155
by:
2006 Toyota Sienna

I put these on two Toyota Siennas ('06 and '09). Installation was "easy" without any special tools to speak of. I didn't have to remove the bottom bolt of the shock. If you collapse the rubber and use the red plugs to hold them without air, they will fit between the spring coils with a little coaxing. So far very happy with both. Have had the vehicles loaded heavily multiple times and the difference in load capacity and handling while full is impressive. Ride can be a little stiff if you leave the air pressure at 35lbs without a load. I find around 25lbs is perfect for average use. Anyone with a Sienna knows that loaded down and the trailer hitch will drag in and out of parking lots etc. No longer with these on! Drilled through the bottom of the plastic bumper on one for the valves. The other one I attached an angle bracket to the plate where you would mount a larger trailer power plug. Would absolutely recommend these to anyone with a Sienna. JL in SC.



- F4155
by:

Product works as advertised. Surprising held most of its pressure after a year without further inflation. Provides very good suspension assistance when trailer tongue hitched to minivan.



- F4155
by:

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



- F4155
by:

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



- F4155
by:
2008 Toyota Sienna

I did not actually time the install but I believe it was less than an hour. I have been loading my 2008 Sienna very heavy when going on vacation. This last time my trailer hitch that I use to haul 5 bikes dragged leaving the driveway and was just a few inches off of the pavement when sitting on the level. I installed this system and tested the load with live body weight, I had a family visiting, they crawled into the van and it did not sag half as much as before. My next big trip is coming up in a week, so we will be giving it the full road test then. I recommend this product.


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



- F4155
by:
2011 Toyota Sienna

This Firestone #F4155 air-bag product is excellent. The fit to my 2011 Toyota Sienna was just as described. I installed the bracket and the two air-fill valves in the jack compartment, easy to get to and out of the weather. etrailer has been a pleasure to deal with.


Comments
Love the product. Had it installed by my favorite local Toyota dealer. Makes a nice difference towing our Park Liner Fiberglass Egg Camper. Would certainly recommend.
Bruce B - 02/01/2016



- F4155
by:
2015 Toyota Sienna

I'm very happy with my Firestone Coil-Rite kit for my '06 Sienna. I added a "Tee" to join the bags together and routed the schrader valve to exit inside my fuel fill door. It was a little extra work, but well worth it as it's out of the weather and sight, and I don't have to scrabble around on the ground in the slop to check / adjust the pressure. I run 15 -17 lbs when I'm not hauling a load and that seems to help with body roll, and up to 25-28 psi fully loaded. The kit does the job it was intended for, and hasn't leaked a snif of air since I installed it a year ago. Three thumbs up!


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



- F4155
by:
2008 Toyota Sienna

I installed Firestone Coil-Rite Air Helper Springs and they work great. With minimum air pressure they improved the unloaded ride and driveability. Loaded the van for vacation, added air pressure to bring the ride height back to the normal ride level and the van drove and handled better than when it was new. Followed your on-line installation video and installation was a breeze. The installation instructions with the kit were poor and incomplete. .



- F4155
by:

Still holding pressure and does what I need. Van is more stable unloaded, even with new shock dampers it's better. With a full load of hundreds of pounds in back the van is much more stable and does not wallow like a whale near as much. Towing trailers is much better too. Didn't expect airbag pressure to hold for months and months but no leaks so far. Only issue was as expected...little bit of elbow grease to install bags and find best airline routing. some bag rubbing squeeks in the coils but I did expect some inherent to it's design. Nice product I would recommend to friends.



- F4155
by:
2011 Toyota Sienna

These were surprisingly easy to install using ramps and a floor jack and really helped with preventing our Sienna from bottoming-out when carrying heavy loads on the hitch mounted luggage carrier. Highly recommended. Be sure to watch the installation video on etailer!



- F4155
by:
2011 Toyota Sienna

Excellent product, installed on 2011 Toyota Sienna that tows 3,000# Hybrid Travel Trailer. Works great to keep rear level (along with Anderson Hitch Weight Distribution). We now run air in them without the trailer as well to help prevent typical Sienna sag when loaded with people or loads.



- F4155
by:
2006 Toyota Sienna

Installed on 06 Sienna. Bought these for towing our 16' boat. Had a mechanic buddy put the bags in and ran air lines myself. Had one initial leak but I recut the end of the air line and it works fine. Noticeable difference when inflated to 25 psi. Some slow pressure loss over 24 hrs but well within driving times needed. Overall excellent service from etrailers and a very good product so far.



- F4155
by:
Toyota Sienna

This was my second order with Etrailer. AWESOME. Product went out same day it was received. Great service and pricing, with service being the most important to me. The air bag support system for my Toyota Sienna van's rear spring coils was easy to install with very minor modications. They made a huge difference on the back end of the van "hitting" the ground when loaded. Just what I needed to pull a trailer.



- F4155
by:

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



- F4155
by:

Fit exactly as described, installation was not difficult



- F4155
by:
2013 Toyota Sienna

Great product in a very low price



- F4130
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


- F4179
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


- F4174
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


- F4176
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.



- F4182
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


- F4170
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


- F4170
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



- F4124
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.



- F4118
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.


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Ask the Experts about this Firestone Vehicle Suspension



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    view full answer...
  • Recommendations for 2011 Toyota Sienna and Motorcycle Carrier
    For your 2011 Toyota Sienna, I recommend the Draw-Tite Max-Frame Trailer Hitch Receiver - Custom Fit - Class III - 2" # 75237. Using this trailer hitch receiver, you can use the Detail K2 Motorcycle Carrier # K2TMC201 which weighs 87 lbs. When you use this carrier, it would be wise to use a suspension enhancement to keep the back end from sagging. I recommend the Timbren Rear Suspension Enhancement System # TTORSEN04 for your application for a maintenance free option or the Firestone...
    view full answer...
  • How to Choose the Correct Ball Mount for a 2005 Toyota Sienna
    In order to choose the correct ball mount for your 2005 Toyota Sienna you would want to measure from the ground to the top of your hitch receiver tube opening and from the ground to the bottom of the coupler on your trailer while level. The difference between the two measurements will give you the correct amount of rise/drop you will need to look for in a ball mount. I have attached a help article that will walk you through this process as well. The most common ball mount used for this...
    view full answer...


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