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FITS 2013 Toyota Prius
Firestone Coil-Rite Air Helper Springs - Rear Axle

Firestone Coil-Rite Air Helper Springs - Rear Axle

Item # F4136
Our Price: $109.38
You Save: $71.02
Vehicle Suspension
Confirmed to Fit
2013 Toyota Prius

2 Wheel Drive Models

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Firestone vehicle suspension for your 2013 Toyota Prius are available from Installation instructions and reviews for your Toyota vehicle suspension. Expert service, and great vehicle suspension prices. carries a complete line of Firestone products. Order your Firestone Coil-Rite Air Helper Springs - Rear Axle part number F4136 online at or call 1-800-940-8924 for expert service.
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2013 Toyota Prius - Firestone Coil-Rite Air Helper Springs - Rear Axle

  • 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 Toyota Prius, improve braking and handling, and reduce tire wear.


  • 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


  • 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.

W237604136 Firestone Coil Rite Air Bags - Suspension Kit - Rear Axle

Firestone 4136

Installation Details F4136 Installation instructions

Customer Satisfaction Score:

Customer Reviews

Firestone Coil-Rite Air Helper Springs - Rear Axle - F4136

Average Customer Rating:  4.4 out of 5 stars   (498 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.

2012 Toyota Prius Plug-In Hybrid

Ordered From QC,Canada. Delivery took 13 days. Installed on my driveway in my Toyota Prius 2012. It's a 2-person job, took 1.5 hr total. Not hard to do

2007 Hyundai Accent

Good product and easy to install if you are a little handy with tools.


Quick, prompt service.
These work well.
Have used them on numerous vehicles. Not always easy to get in place.


Order these for a 2013 Toyota Prius C. Website here didn't list this part worked for my vehicle. I cross referenced through other websites to find which model was going to work for my Prius C and came across the Toyota Yaris has the same size rear spring as my Prius C, so I put two and two together and placed the order. Product arrived and installation was a breeze ( that's if you knew before hand what is expected) I researched by viewing video after video of different ways to install these bags. As long you can raise the car high enough off the ground and secure vehicle with jack stands. You won't have any trouble sliding these air bags between the springs. I've read reviews where they stated they had a tough time pushing bags between springs. The only thing I can think of is they did not raise vehicle high to allow the rear suspension to extend or they removed the tires during installation. My advice-keep the wheels on, the added weight of the wheels help extend the springs to more to give that extra gap to slide air bag in between spring.
So if you own a 2013 Toyota Prius C, these air bags will work for you. Now I can transport two adults in the rear seats and not have to worry about tires hitting the rear fenders when driving over bumpy roads

They still function like day one after the install. Have to add air every other week, sometimes longer if Im not transporting passengers in the rear seats
Michael - 06/30/2020


Like all my etrailer purchases
value great provider with fast economical shipping.
Bag system was great upgrade to my Prius V which great performance and cargo area but Not a suspension for weight on a hitch receiver nor heavier cargo behind rear wheels. Perfect solution! Takes some skill to install but not inordinate. Thanx

2010 ToyotaPrius

Been great on my 2010 Toyota Prius. Have had them now for about 1 year. I haul many things in the back of this car and these air bags are up to the task. No more low squatting car!

2010 ToyotaPrius

installation instructions could be better

you deflate to work into spring, once you get one end in you should release the deflater stopper, makes it easier to work into place.

Also, if you work it in from the top, once you get it mostly in, rotate it around like you are screwing it in place, this is my 3rd set to install, struggled on the 1st set, easy to do now.

Just a few suggestions

2010 ToyotaPrius

Installation of the first air bag took me about 25 minutes, and the second one about 5 minutes. I heated the second air bag with a heat lamp to make it more flexible. I think my 2010 Prius drives better with them installed.


I was amazed seller shipped same day--as i ordered in evening! Product seems to be complete and well made, installing now.


Love that I can load up the Prius and I get no sag


Installation was not that hard and it makes a big diffenence in the ride of my vehicle. I have a 10 year old car and the springs were not performing well even though I changed the shocks. These bags are the greatest, especially for the cost.





Another great transaction you guys rock



Review from a similar Coil-Rite in Vehicle Suspension

These work great for the VW Atlas!! They reduce the rear end sag when pulling a travel trailer or putting the roof tent on and loading all the gear for some overland trail riding and camping!! They are a must for any adventurous Atlas Owner!


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.

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


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.

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


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.


Review from a similar Coil-Rite in Vehicle Suspension

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.

Thanks for reaching back out about this. I have gone ahead and sent you an email with some more contact information for Firestone.
-- Etrailer Expert Brooke M - 11/01/2022


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.


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.

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


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!

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

Show More Reviews

See what our Experts say about this Firestone Vehicle Suspension

  • Is an On-board Air Compressor Needed to Use Firestone Coil-Rite Air Helper Springs
    You do not have to have an on-board compressor or control unit to use the Firestone Coil-Rite Air Helper Springs # F4136. To add air you would need to use a compressor of some kind. If you happened to have a portable one that would work. Otherwise you could use the ones at gas stations. To remove air you would just have to depress the valve, just like letting air out of a tire. I have included a link to the installation details for you. Having the suspension enhancement at the rear only...
    view full answer...
  • Does Firestone Coil-Rite Air Helper Spring Kit # F4136 Fit 2014 Toyota Yaris
    The Firestone Coil-Rite Air Helper Spring Kit # F4136 that you referenced is indeed a correct fit for your 2014 Toyota Yaris as indicated on etrailer's fit guide. The Firestone website just has not been updated. I confirmed with my technical contact there that this kit is a correct fit. The installation instructions are linked for your reference. If you wish to avoid the need for manual inflation of the air bags you might consider the Firestone Level Command II, part # F2158, which allows...
    view full answer...
  • Replacement Inflation Valve for Firestone Air Bag Kit
    Sounds like you are looking for a inflation valve like the part # F3032-1.
    view full answer...
  • Is There Reason Not to Inflate Firestone Coil Rite Air Bags to Same PSI
    The only time it would be advantageous to have ability to inflate the air bags of the Coil Rite # F4136 separately would be if you had an uneven load from left to right that you were trying to level out. For a union tee to allow you the ability to inflate both bags to same PSI you could easily use the part # F3105-1.
    view full answer...
  • Firestone Coil-Rite Air Helper Springs # F4136 for 2011 Toyota Prius
    According to my contacts at Firestone, the Coil-Rite Air Helper Spring kit you mentioned, part # F4136 will indeed fit the 2011 Toyota Prius. When installing the system, it is crucial that the cuts made in the air line be absolutely square to avoid air leakage. We recommend using a tubing cutter like part # AL10530. Keep in mind that the Air Helper springs will not increase the capacity of your vehicle. For installation details, click the provided link.
    view full answer...
  • Will the Firestone Coil-Rite Air Helper Springs Part # F4136 Raise/Lower My Vehicle
    The Firestone Coil-Rite Air Helper Springs part # F4136 will not raise or lower your 2014 Toyota Prius whether they are deflated to the minimum psi (5) or inflated to the maximum psi (35). Some of the benefits of these air bags include: keeping your vehicle level when you are hauling a heavy load, improving steering control/balance, and reducing tire wear. To cut the airlines, you will want to use theTubing Cutter part # AL10530 to ensure you are receiving a secure and snug connection...
    view full answer...
  • Suspension Enhancement Recommendation for 2013 Toyota Prius
    We actually only have one suspension enhancement fit we can recommend and it's only for the 2013 Toyota Prius and not the V. For that you'd want the Firestone air bag kit part # F4136. The SumoSprings you mentioned cannot be used on the Prius.
    view full answer...
  • Availability of Suspension Enhancement that Fits 2014 Toyota Prius
    We have suspension enhancement that fits your 2014 Toyota Prius with the Firestone Coil Rite kit part # F4136 but we do not have any Coil SumoSprings Kits that fit your vehicle.
    view full answer...
  • Rear Suspension Enhancement for a 2006 Toyota Prius
    For the 2006 Toyota Prius we do have one option that will help with a sagging rear end. You can use the SumoSprings, # CSS-1145R. These guys will fit in the spaces between coils on the rear coil springs and take care of the rear end squat. Suspension enhancement is meant to be installed on a vehicle that has suspension that is in good working order. I recommend having the rear suspension checked out first just to be safe. I have linked a video showing a typical installation of SumoSprings...
    view full answer...
  • How Often Should I add Air to my Firestone Coil-Rite Air Helper Springs on my 2015 Toyota Prius
    When using the Firestone Coil-Rite Air Helper Springs Part # F4136 on your 2015 Toyota Prius you should not have to add air on a regular basis. I sometimes see a slight pressure loss when it goes from hot outside to cold and you'll have to add a bit to get it back to pressure similar to the way a tire on a vehicle fluctuates up and down slightly with weather. If you are adding air on a regular basis to the bags to maintain your desired pressure then you have a leak in the system and...
    view full answer...

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