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Hauling gear or towing a heavy trailer can make your rear end sag and throw off your steering and braking. These Firestone Coil-Rite air springs fit inside your existing coil suspension to provide extra support—up to at least 500 lbs and at most 1,000 lbs of load-leveling capacity. With the added cushion from the air bags, your vehicle stays level, steering feels balanced, and headlights keep their proper aim even under heavy loading or rough road conditions.
Every load is different, and these air springs let you fine-tune how your suspension feels. Adjust air pressure manually between 5 psi and 35 psi to match what you’re carrying. Keep more pressure when loaded up for towing or drop it down when empty for a smoother ride. Each bag has its own inflation valve, so you can level off-center loads side to side for better stability and even tire wear.
When bumps and potholes hit, the air springs absorb the shock before it reaches the cabin. They reduce body roll, minimize bottoming out, and keep the ride controlled whether you’re on highways or uneven backroads. By maintaining steady contact with the road, braking and handling feel more consistent even with gear in the back or a trailer behind you.
Made from elastic polyurethane, these Coil-Rite springs are designed for years of service under real-world hauling conditions. The kit includes brackets, air springs, hardware, air line, and separate valves for manual inflation—everything needed for installation. Replacement springs are available if you ever need to service an existing setup, so your suspension support can stay reliable mile after mile.
Customer Satisfaction Score:
93% were satisfied with this product
7% of customers were not satisfied
Ratings & Reviews
John S.
10/27/2025
After using the Balloon coil spring for about a year, Ive learned that it does not raise the suspension like an air shock as I was hoping, but rather dampens the heavy load ride, and makes it harder to bottom out the suspension. It has worked great. Held air very well. No leaks. Very happy with it.
Gwendolyn Y.
10/27/2025
Patrick B.
8/10/2013
Use a concentrated soapy water solution in a spray bottle and start check the areas where the hiss is coming from. If you have an audible hissing sound, it will not hold pressure for long and you do not want the coil springs to be moving on a flat bag.
Bob K.
8/12/2013
Thanks for the awesome customer support.Making a fresh cut on the inflator end helped. The hissing has stopped, and no more leaks have been detected.I just got back from the maiden road trip 350 miles round trip. Its certainly not a long road trip, but it was enough to notice the dramatic improvement.Normally, when I attach my travel trailer 3500 GVW my Rav4 with tow prep option sags in the back. My trailer has the weight distribution kit that helps level it out. But, it only helps with the trailer weight. When I carry SCUBA equipment in the back of the Rav4, it still sags, and the weight distribution kit doesnt help with that.But... With the F4174 Coil-Rite air springs, there is very little sag. In fact, I was able to attach the trailer without much sag at all before I attached the weight distribution bars. With the SCUBA gear in back, the Rav4 stayed level no visible sag.In fact... the hole towing experience was dramatically improved. The ride was a lot smoother. There was a lot less galloping. I hardly felt the bumps on the road.Im surprised that Toyota doesnt offer this as an option. That such a simple and inexpensive alteration could make such a dramatic improvement is really surprising.I would like to change my rating to 5 stars.
Patrick B.
8/14/2013
Bob K.
2/9/2015
The good news is... These are awesome and should be available as an option from the factory. With the back end loaded and the trailer connected, the rear of the Rav is still off the ground. It also improved handling as the front end stays on the ground.It turns out that I hadnt buggered the quick release. I had just cut the hose at an angle. You need to make sure you cut the hose square. After cutting the hose square, the bags stay inflated without hissing.The Bad news is... if you have work done around the exhaust system requiring a cutting torch, you need to be careful and have some sort of shield to protect the bag and hoses. I discovered this the hard way. A small piece of molten metal cut through the bag like butter.But, for some reason, putting the 3rd bag was easier than either other the first two.I wound up attaching a small piece of angle iron to the hitch bar. This worked very well and avoids cutting the hole in the car.Having the tubes dangle from the bottom of the car hasnt been a problem. I was able to tighten them up a bit and route them better once the angle iron was installed.This has made a big difference
John
6/21/2020
No issues. Some noise but plan to lubricate with Teflon spray so the springs don’t squeak against it. Also periodically check your pressure I keep them inflated around 5-10 lbs when not hauling or towing. We did a trip to Canada hauling the motorcycle from Sacramento to Calgary and back not issue one! The hitch and air bags keep the car level and handling perfect.
Ed L.
5/29/2018
Thanks for the follow-up: reviews at this point are much more useful than ones immediately after purchase. They’re working very well and we’re very happy with them. They do tend to squeak a bit when low on pressure and they do seem to leak a tiny amount over time but neither are a big deal. I would definitely get them again.
Jenny N.
12/29/2021
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.
Bob W.
6/21/2020
After a year the suspension works great.
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Chris K.
11/12/2021
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.