Firestone Coil-Rite Air Helper Springs Installation - 2012 Toyota 4Runner

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How to Install the Firestone Coil-Rite Air Helper Springs on a 2012 Toyota 4Runner


Today in our 2012 Toyota 4Runner, we'll be installing the Firestone Coil-Rite Air Helper Springs, part number F4135. To give you an idea of the operation of the air helper springs, we're going to add approximately 1100 pounds of weight to the manufacturer's install suspension and then run it through our test course. Along the slalom course, you'll notice the vehicle sag and body roll. Then going over the bumps, you'll notice the bouncing body and roll of the vehicle. We'll go ahead and repeat the same process with our air helper springs installed. Notice the vehicle sag and body roll.Then going over the bumps, you'll notice the bouncing body and roll of the vehicle.

Next, we'll go ahead and give you a few measurements. First, with no weight and manufacturer's install suspension, the vehicle sits at 36 inches from ground to the edge of wheel well. Then with the approximate 1100-pound, the vehicle body will drop to 33 inches and with the airbags installed and aired up with 1100 pounds springs the vehicle back up to 34.5 inches. Let's go ahead install our airbags. Note, to begin our install we've already gone ahead and raised the vehicle and remove the rear wheels and spare tire.While it's not a requirement to do this, it makes it much easier to do the install.

We'll go ahead and start our install by removing the bolts to release the bracket for the emergency brake cables. Once the bolt is removed, we can go ahead and remove the bracket so it'll free up some room for the cable. Keep in mind we'll repeat the same process on the opposite side. With both emergency brake cables loose, we'll move underneath the vehicle and remove the bolt that secures the brake line to the body of the vehicle. We'll go over the passenger's side and remove the bolt that secures the bracket for the ABS wiring.Next, we'll remove the bolt for the pan hard rod that connects the rod to the differential on the driver's side.

Next, we'll move to the lower shock mount where we'll remove the bolt and then use some spray lubricant around the lower shock mount and pride the shock off the lower shock mount. We'll repeat the same process on the opposite side. We'll move to the sway bar where we'll remove it from the rear axle. To do this, we'll remove four fasteners two on each side to secure the sway bar to the rear axle. With the bolts out, we'll pull down the sway bar to release the sway bar from the bracket.Before we remove the spring, we'll want to put a jack underneath the passenger side, raising the passenger side up which will force the driver's side down.

Next, we'll go ahead and mark the spring. We're going to mark the spring so that we can get it back in position as it is currently. By forcing the driver's side down, it will allow the spring to become free. You may need to pull down the axle down slightly to allow for enough room to get the spring out. With our spring out, we can go ahead and remove the top mount. With the top mount out, remove the four convoluted sections of the top mount.We'll go ahead and set it in our device and cut it off now. With it cut out, we can see the hole that go through the top of the mount. This is where our air line will run. We'll go ahead and reassemble the spring to reinstall it. We'll take the airbag, put it inside the spring and then reinstall the mount. Before we install the spring back into the vehicle, we're going to go ahead and route the air line. The air line will go through the top spring mount to the pre-drilled hole. We'll bring the spring back into position going through the rubber mount down to the top of the spring with our spring back in position and lined up with our marks we made previously.I recommend to install the black line protectors provided with the install kit. The line protector will slide over the blue hose to protect the lines that goes to the top of the mount. Once we have the spring back into position we can route the line into the airbag. When installing it into the airbag, we'll push it in firmly and pull back to seal it in place. We'll lower the jack on the passenger side moving it over to the driver side and repeat the same process. With both airbags installed and our springs back into position, we'll go ahead and reinstall the four fasteners two on each side to secure the sway bar to the rear axle.We'll go ahead and reinstall the shocks. With both shocks installed and secured, we'll go ahead and reinstall the pan hard rod. In some cases, it will not line up by just pushing it into position. If we take the jack, and jack up the passenger's side of the differential, it will force the rod into position. It will slide our bolt back into place and tighten it down. We'll go ahead and reinstall the bolt that secures the bracket for the ABS wiring. We'll go ahead and reinstall the bolt that secures the brake line to the body of the vehicle. We'll go ahead and reinstall the bolts for the emergency brake cables. With everything reinstalled, we'll move to the back of the vehicle.We'll make a bracket to mount our inflation valves using the tow-ready universal mounting bracket, part number 18136. To make it easier to get our bracket in position, we'll go ahead and remove the rear bumper cover bolt here on the driver's side. We'll go ahead and put it over the rear bumper beam. Then using a paint marker, we'll go ahead and mark out two holes for our inflation valve and a section that can be cut off. Using the step it process, we'll go ahead and drill our pilot hole and then our final size, the 5/16 hole for the inflation valve. With both holes, drilled out, we'll go ahead and use our cut off wheel to cut out the excess metal.To secure the bracket to the bumper, we'll use a self-tapping screw. Before I install the screw, I'll go ahead and use a bit to make a pilot hole going through the bracket only. With our pilot hole in place, we'll go ahead and take the self threading bolt and secure the bracket directly to the rear bumper beam. With our bracket secured, we can go ahead and install the inflation valve. First we'll install the flat washer under the valve and feed it to the back of the bracket. We'll install our second flat washer into the valve and secure it with a nut. Then we'll go ahead and tighten it down.Once we have both inflation valves installed, we'll go ahead and complete routing the air line. We'll cut off any excess from the airline and then install the line into the back of the inflation valve repeating the same process we used in the airbag by pushing it firmly and pulling out to seat it in place. Next, we'll go ahead and use the zip ties provided with the install kit to secure the line as necessary. With our lines router, secured, installed, we'll go ahead and cut off the excess from the zip tie to clean up our install look.Next, we'll go ahead and air up the airbags. Once they're aired up, we'll use a soap and water solution to spray each one of the connection points to check for leaks. Now that we verified that our system is sealed up, we're ready t hit the road. That does it for the install of the Firestone Coil-Rite Air helper Springs, part number F4135 on our 2012 Toyota 4Runner. .


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Info for this part was:

Video by:
Andrew K
Installed by:
Jeff D
Video by:
Joshua S
Test Fit:
Nicholas E
Video Edited:
Jacob T
Test Fit:
Rick A
Video Edited:
Andrew L
Video Edited:
Chris R
Video by:
Jonathan Y
Installed by:
Robert C

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