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Firestone Vehicle Suspension for the 2006 Toyota Sienna

Firestone Vehicle Suspension

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Code:   F4155



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Firestone Coil-Rite Air Helper Springs - Rear Axle - 2006 Toyota Sienna

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 Sienna, 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 Toyota Sienna
  • Keep your Toyota Sienna 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 Toyota Sienna
  • Made in USA


  • Load-leveling capacity: at least 500 lbs (at most 1,000 lbs)
    • Coil-Rite springs will not increase your Toyota Sienna'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 Toyota Sienna to better handle a heavy load or trailer. Hauling heavy loads or towing a heavy trailer can make the rear of your Toyota Sienna 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 Toyota Sienna 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 Toyota Sienna 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 Toyota Sienna'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 Toyota Sienna's spring seats.

4155 Firestone Coil Rite Air Bags - Rear Axle

Video of Firestone Coil-Rite Air Helper Springs - Rear Axle

Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.

Video install firestone air helper spring kit 2006 toyota sienna f4155
Firestone Coil-Rite Air Helper Springs Installation - 2006 Toyota Sienna
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Video Transcript for Firestone Coil-Rite Air Helper Springs Installation - 2006 Toyota Sienna

Today on our 2006 Toyota Sienna we'll be installing the Firestone Air Helper Spring Kit Part #F4155. Our first step will be to install the air bag inside the coil spring. To make it more accessible and easier to install the air bag, it may be necessary to remove the lower shock mounts so that the axle can swing down further away from the vehicle. To do this, we'll remove the nut washer on the shock mount and then the fender washer and slide the shock off the lower shock mount. Now we can go ahead and take the weight off of the vehicle. To do this, we'll raise the body allowing the suspension and axle to fall. As you can see the wheel speed sensor wire is starting to become stretched. In order not to harm the wire we'll go ahead and disconnect the wire from the wheel speed sensor.

To disconnect the wire, we'll use a small pocket screwdriver and press on the lock and then remove it from its connection point. Next we'll go ahead and remove the bolt securing the bracket. Now we'll go and repeat the same process on the driver side so we can continue raising the body of the vehicle. Now that we've extended the springs you can see the opening of the spring is much larger than it was previously. This will now allow us to be able to go ahead and crush the air bag and slide it into the spring. To crush the air bag and to keep the air out while we install it, we'll use a piece of short line and airline tubing plug and slide it into the nipple of the air bag.

Now we're ready to go ahead and install into the coil spring. Keep in mind, the airline will face up. Now that we've got our bag into the spring we'll go ahead and remove the airline. To do this, we'll simply press on the gold collar around the airline using a flat blade screwdriver and then remove the air line. Now as you can see, it will allow air back into the bag and we can help it re-conform to its normal figure. After we have the air bag installed and back in its normal shape, we'll need to install the spacer disk provided with the install kit.

This will assist in protecting the line and nipple of the air bag. Now we're ready to go ahead and repeat the same process on the driver side. With both air bags installed, we can now go ahead and start reinstalling the ABS speed sensor wire and shock. Now with everything reinstalled, we'll go ahead and put the weight of the vehicle back down on the rear axle. With the air bag and protective disk installed. We're going to go ahead and take this opportunity to install the air line.

To do this, we'll run it through the top of the coil spring mount and down to the air bag. We'll go ahead and pick up on the disk and make sure that the line goes into the air bag and is secured. Now we're ready to go ahead and start routing our airline. Keep in mind when routing your airline you want to stay away from as many moving components or excessive heat, such as the exhaust, as possible. In order to assist us in routing the wire we're going to use some 1/2 inch metal Loom Clamps, Part #A0500, and self-tapping screws to secure them. We'll be routing our airline back to the rear hitch where we'll fabricate and install a bracket to secure it to. We'll be making one of these out of the Tow Ready Universal Mounting Bracket, Part #18140. To turn this into our mounting bracket, we'll need to drill out holes that'll fit the inflation valve. Nowwe can go ahead and mount the mounting bracket using the worm clamp provided with the install kit for the mounting bracket. Then we'll go ahead and install the inflation valve. To install the inflation valve, we'll take the valve, the two flat washers and nut. We'll first install the flat washer onto the valve, put it through the bracket, and then secure it with another flat washer and nut. Now we can go ahead and repeat the same process on the other side. Once we got our lines routed to the bracket, we'll go ahead and cut off the excess from the airline. We're ready to install the inflation valve. With our line routed through the bracket, we'll go ahead and slide the inflation valve on to the line. With both sides secured, we can go ahead and air up the bags and check for leaks. To check for leaks we'll just be using a bottle of soap and water. As you can see, we don't have any leaks and that'll complete our install of Firestone Air Helper Spring Kit, Part #F4155, on our 2006 Toyota Sienna. .

Customer Reviews

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

Average Customer Rating:  ratingratingratingratingrating4.7 out of 5 stars   (3 Customer Reviews)

- F4155

ratingratingratingratingrating by: John L.12/09/2013

Is this review helpful?

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. 109652

- F4155

ratingratingratingratingrating by: Mark M07/06/2011

Is this review helpful?

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.18542

- F4155

ratingratingratingratingrating by: Jim R03/15/2012

Is this review helpful?

Fit exactly as described, installation was not difficult33997

Ask the Experts about this Firestone Vehicle Suspension
Expert Answers about Firestone Coil-Rite Air Helper Springs - Rear Axle - F4155                                             Do you have a question about this Vehicle Suspension?

  • Valve Stem Location Recommendation for Firestone Coil-Rite Air Spring on a 2006 Toyota Sienna
  • The first priority for the valve stem location when installing Firestone Coil-Rite Air Helper Springs # F4155 is that the airlines will be routed in such a way that they would not come in to contact with any areas that might pinch or melt the lines. With that being said, I have seen a lot people install them into the rear bumper, out of the way of anything that might hit it, and not directly behind a wheel to prevent road grime from building up on it too much. You would do this by drilling a
    view full answer...

  • Availability of Suspension Enhancement System For Front and Rear of 1996 Toyota Land Cruiser
  • The Firestone Coil-Rite Air Helper Springs, part # F4124, would be the correct part number for the rear of your 1996 Toyota Land Cruiser if it is a four wheel drive model. They do not offer any system for the front of your vehicle. I would not recommend to try to use the rear springs on the front of your vehicle. I am including a link to the installation instructions on the Firestone rear springs. Firestone does offer lift spacers for vehicles that are lifted but they will not work with the C
    view full answer...

  • Why Does Firestone Coil-Rite Air Helper Springs Come with 2 Air Lines
  • Well you would not want either bag to leak! But you can use a T-fitting to run both lines to one line and fill the bags at the same time. However, if you want to be able to level the vehicle side to side, you would need two separate lines which is why they come with one for each air bag. For a T fitting you can use # F3273-1. I also recommend a tube cutter # F9009 to get a nice straight cut on the air lines. A cut that is not straight is more likely to leak.
    view full answer...

Toyota Sienna Accessories

Info for this part was:

Photos by:
Theodore B

Video Edited:
Zack K

Video by:
Andrew K

Written by:
Tyler C

Expert Research:
Michael H

Expert Research:
Jeff D

Expert Research:
Jameson C

Test Fit:
Nicholas E

Updated by:
Adele M

Video Edited:
Dustin K

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