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  1. Vehicle Suspension
  2. Firestone
  3. Air Springs
  4. Towing/Load Leveling
  5. Rear Axle Suspension Enhancement
  6. Light Duty
THIS ITEM IS NOT A FIT FOR
2012 Mercedes-Benz Sprinter
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Firestone

Firestone Coil-Rite Air Helper Springs - Rear Axle

Part Number: F4182
$158.89
Retail:$208.83
You Save: $49.94
Vehicle Suspension
Not Confirmed to Fit

2012 Mercedes-Benz Sprinter

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For safety and stability, air springs are the perfect partner for your rear suspension when you are hauling heavy loads. Springs fit inside existing coil springs to help level your vehicle, improve braking and handling, and reduce tire wear. Great Prices for the best vehicle suspension from Firestone. Firestone Coil-Rite Air Helper Springs - Rear Axle part number F4182 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (761)
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Firestone Vehicle Suspension - F4182

Highlights

  • Custom Fit for Your Vehicle: Mounts to existing attachment points
  • 1,000-lb Load Support: Keeps your vehicle level under heavy loads for safer handling and braking.
  • Better Steering Control: Balances weight to maintain traction and headlight aim when loaded.
  • Smooth, Stable Ride: Absorbs road shock and prevents bottoming out for comfort on rough roads.
  • Adjustable 5–35 psi Air Pressure: Lets you fine-tune height or side-to-side balance for uneven loads.
  • Durable Polyurethane Design: Long-lasting construction stays elastic for consistent support.
Made in USA

Features to know about

Keep the Rear End Level and Handling Sharp: Load-Leveling Support up to 1,000 lbs

Heavy cargo or a trailer can make the rear of your ride sag, throwing off steering and braking. The Firestone Coil-Rite Air Helper Springs fit inside your existing rear coil springs and add load-leveling support for at least 500 lbs and at most 1,000 lbs. By maintaining even load distribution with adjustable air pressure from 5 psi to 35 psi, they help keep your vehicle level, improve braking response, and reduce tire wear under load.

Smooth Out the Ride and Prevent Bottoming Out: Adjustable Air Pressure

Road shock and body roll can wear you out when hauling or carrying weight that’s off center. Each Coil-Rite spring has its own manual inflation valve so you can adjust air pressure side to side for balanced support. Fine-tuning the pressure softens contact between the axle and frame, prevents bottoming out, and makes for a smoother ride whether you’re loaded down or running light.

Built to Handle Real Work: Durable Polyurethane Construction

These springs don’t just help with load support—they’re made to last through heavy use and tough roads. Firestone builds each Coil-Rite spring from elastic polyurethane that holds shape and flexibility over years of service. The material resists fatigue during hard work and temperature swings while staying leak-free when properly installed.

Straightforward Install for DIYers: All Hardware Included

Installing extra suspension support doesn’t need to be a shop job. The kit comes with the brackets, air springs, hardware, air line, and separate valves needed for manual inflation. You route the air lines to your bumper for easy access to the Schrader valves. Compressors, tanks, or in-cab switches are optional add-ons if you want faster adjustment later on. Once installed inside your coil springs, the system quietly enhances stability every time you hit the road with a load.

Specs

Weight and Capacity

  • 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.

Air Pressure

  • Adjustable air pressure: 5 psi to 35 psi

Firestone Coil-Rite airline installation diagram showing how to route air tubing from air springs to rear bumper inflation valves.

Warranty

  • 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 Helper Springs kit components including blue air bags, brackets, tubing, and hardware for rear suspension installation.

W237604182 Firestone Coil Rite Air Bags - Suspension Kit - Rear Axle

4182

Installation Details F4182 Installation instructions

This Product Fits The Following Vehicles




Ratings & Reviews

4.4

761 reviews
Review sort icon
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:

THE SERVICE IS AMAZING IHAD A SMALL ISSUE AND IT WAS HANGELED BY PAULA IMEDIATELY THANK YOU THE PRODUCT IS INSTALLED ON A 2014 VW BEETLE THERE IS A HOLE IN THE BOTTOM OF THE SPRING HOLDER SO I INSTALLED THE AIR SPRING WITH THE LINE AT THE BOTT0M AND THREADED THE LINE STRAIGHT OUT THE HOLE PRETTY SMOOTH THANKS AGAIN



by:

my air bags for my 23 ram were easy to install, the service was excellent. I will be telling every body I know about how friendly and easy it was to order from you.



by:

Worked well. Second time I’ve installed them on a 4Runner. The result was a needed improvement in sway, dive and sag. It also helps the steering wander.



by:

Great upgrade for carrying weight in the back or towing a trailer. They are a bit tough to install. I found twisting the bag over in the middle and inserting it between the spring to the trick. Insert the top side on the passenger bag first. Insert the bottom side first on the driver side take care with the week ass tubing because if it folds over on itself in a coil, it will remain pinched which I can see will cause problems in the future. The tubing was better 20 years ago than what they give you today. One tube replacement over $30!! Ridiculous !! I like the right height adjustability and my truck feels more stable with a load of weight in the back of my truck advertised in the video shown below.



by:

Fit my 2001 Expedition perfectly. Took away all the sag when towing and like others have said I like the way it rides better even unloaded with 5PSI in the bags. Well worth the money, easy install. FYI this was my first time using bags on any vehicle, I was nervous and these were fabtastic!



by:

Firestone airbags have worked well for my 2017 4Runner. When I'm not attached to my camper, I keep the airbags deflated to about 5 PSI. But when I put my trailer 3,500 lb. Onto the back of my 4Runner I get several in of sag. I pump up the airbags to about 20 psi and I level out the whole rig. What a perfect hybrid system to have. It's there when you need it. Perfect system for a sagging. Backside on a rear coil spring 4Runner. Thanks, e-trailer



by:

These were just as described as far as quality and look. The installation of them were a little more difficult than they show in the video but can easily be done by someone with basic skills. I would recommend if you have the ability to remove the springs and then just insert the bags that way as I couldn’t get one in without doing that. Otherwise the install is pretty straightforward. Haven’t used them with a load or towing yet but hopefully they will work as designed.



by:

It fit great. And works like a champ... I couldn't be happier with these air helper springs! E trailer made it easy and they followed up with me to make sure i'm pleased with the product... Very happy with the service.



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 initially ordered the wrong airbags. I called eTrailer and Jeremy H. was very understanding. He got the right ones immediately shipped out and sent me a return label and info while I was on the phone with him. The bags seem good quality comparable to my previous Airlift bags. Instructions were well written and all hardware was accounted for in the shipment.



by:

Easy install on lc200, it’s only been a couple days but test run with a trailer was great. Recommend getting getting inflation bracket (Firestone WR17607560) to reduce the need for any drilling if you don’t go with onboard compressor.



by:

The airbags were difficult to install on a 2021 Sienna. It required removing the rubber stopper from inside the coil spring. Once that was out, install was easy. However, these need to be installed with the valve down as the plastic spacers fall out when the van is lifted for service when installed right side up as recommended. Upside down the air hose is routed thru the center of the plastic donut spacer which holds it in place when the van is lifted. However, once installed "upside down" the valves tend to pinch on the suspension as they move around. The pinching lets the air out and requires the bags to be frequently repositioned especially after the van is lifted for service. It is a good product, just unreliable and requires much inspection and maintenance to work properly. Will be loading up again for a summer trip and will need to reposition them so they work as I just had the oil changed.



by:

These bags along with minor adjustments to my load leveling hitch made towing my 19.4 No Bo trailer so much more relaxing!I am running 20 PSI and 3/4 of an inch higher than stock ride hight. Easy peasy



by:

I bought this set because I was having problems with one of the airbags I previously had gotten. It was on the right side of my forerunner. It had a slow leak. When I replaced the airbag this time it had a very fast leak. I finally found That if I used NAPA Sil-Glyde to insert tube it seems to be holding air. And I squeezed air bag into the spring. Use soap for sliding it in.



by:

Phone service was excellent. Air bags helped a lot with stability. I found it easier to remove the spring from the Avalanche than to fight with it in chassis. Removing the spring also gave me a chance to clean the dirt and rocks out of the hose routing area. It was a little more work to drop the axle down but it really wasn't that bad. I was able to do it all without a hoist. Just used two floor jacks. I just let one side down at a time. Remove your swaybar link and shock and let one side down. Pull the spring and do the work in a vise. Its much easier than fighting with it on your back. Also put the air hose in really hot water and it will relax its memory.



by:

Well I did not expect to have a one year follow up from ETrailer! I’m a 5 Star happy with these airbags over the AirLift 1000’s I had that blew out just after the warranty was up! These bags are more than twice the product, as you can inflate to >60 psi and that makes for a way more steady ride with weight! I typically run mine at around 45 psi now, the AirLift are limited to 28 psi. The construction is far superior and quality is excellent!!!



by:

arrived as promised



by:

Tremendous help when towing.



by:

Good product. Kit is complete. Doesn't resist well to potholes. Not so easy to install. Even more difficult to remove and replace. A good challenge for a week-end mecanic.



by:

excellent product, improved the capacity of my mitsubishi outlander,



by:

Made a big difference while towing with our 2008 Mitsubishi Outlander.



by:

Installation was easy, and the system has been completely problem free after a year of use.



by:

Good product ! It help a lot for towing heavier loads. Installation was a bit hard to do on my Outlander 2012.



by:

Product does what it says it will do for my 2008 Mitsubishi Outlander. Had a leak in one of the bags but Jean at etrailer.com got me connected directly with Fire Stone. They got a replacement out to me ASAP. Very happy customer TY The picture shows the extra weight I have on my SUV.



by:

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.

Led profile picture

Led

4/17/2022

Not really helping, and theres a slow leak in one of the systems.


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