Last weekend I basically completely replaced the rear air suspension on my Sequoia after it started leaking down overnight. I determined that the culprit was a leaky valve on the compressor, and a leaky valve on the solenoid. I think that one may have failed and took out the other, probably the solenoid first, then the compressor.
While I was in there, I replaced the passenger side air bag because it is from 2012 and has 170k miles. I also replaced all of the hoses, clips, orings, and other parts. The drivers side air bag was replaced about 30k miles ago, so it is almost new.
I have attached the parts list that I made to get everything ordered. The only part that wasn't Toyota was the air compressor, I ended up with the Arnott P3189, which is the oem compressor, direct from the manufacturer. RockAuto carries it for $1016, or about $500 cheaper than OEM. Don't bother with the Amazon, Autozone, NAPA compressors, they are all junk. I think that i ordered six of those cheap ones, total garbage. They are smaller, some didn't have sealed wiring, the air hose clips are under sized, and they look like nothing but problems.
You will need the SST to undo the air lines, it is 09730-00010. Good luck getting one, I ordered mine from Japan. There is a 3D printed one that appears to be the same, I didn't buy it, but it may work. You can get that one on Amazon or Ebay. Supposedly a 1/4" fuel line disconnect tool from Harbor Freight also works, I couldn't find it, but apparently they have it somewhere. Mac Tools has a small diameter disconnect kit that has the 1/4 size, it runs about $100. I didn't try that one, but I almost ordered it because I like tools.
The compressor does come out without taking the bumper off, just undo the three bolts holding it to the bracket, then undo the three bolts holding the bracket to the frame rail. One of those frame rail bolts is on top of the frame rail, you have to do that one by feel.
Solenoid is super simple, two bolts, and three air lines. As long as you have the air line tool, it is simple. You can probably swap it out in 5 minutes.
Air bags... what a pain. They were by quite a bit the most difficult part. They are held in by one tiny bolt, and a flimsy clip. Disconnecting the air line is super easy. Getting them out of the suspension system is ridiculous. I spent probably 3 hours online trying to find the easiest way to do it, and supposedly the easiest way way to remove the shocks, unfortunately the sway bar, and drop the lower control arm. Right before I started doing that, I decided to try some leverage on the upper control arm to open it up. So, I unbolted the upper shock bolt, then nested a 3lb sledge, with a wedge on one side, on top of the brake caliper, then I took a nearly 3' ratchet to the upper control arm bolt, and then my wife pushed the entire suspension down about 2" with the ratchet. That made enough space to get the air bags in and out without too much trouble. Now that I know how to do it, I can probably swap air bags in less than 30 minutes. If you don't have someone to help you, then you will probably need to drop the lower control arm to get the air bag out.
While I was in there, I replaced the passenger side air bag because it is from 2012 and has 170k miles. I also replaced all of the hoses, clips, orings, and other parts. The drivers side air bag was replaced about 30k miles ago, so it is almost new.
I have attached the parts list that I made to get everything ordered. The only part that wasn't Toyota was the air compressor, I ended up with the Arnott P3189, which is the oem compressor, direct from the manufacturer. RockAuto carries it for $1016, or about $500 cheaper than OEM. Don't bother with the Amazon, Autozone, NAPA compressors, they are all junk. I think that i ordered six of those cheap ones, total garbage. They are smaller, some didn't have sealed wiring, the air hose clips are under sized, and they look like nothing but problems.
You will need the SST to undo the air lines, it is 09730-00010. Good luck getting one, I ordered mine from Japan. There is a 3D printed one that appears to be the same, I didn't buy it, but it may work. You can get that one on Amazon or Ebay. Supposedly a 1/4" fuel line disconnect tool from Harbor Freight also works, I couldn't find it, but apparently they have it somewhere. Mac Tools has a small diameter disconnect kit that has the 1/4 size, it runs about $100. I didn't try that one, but I almost ordered it because I like tools.
The compressor does come out without taking the bumper off, just undo the three bolts holding it to the bracket, then undo the three bolts holding the bracket to the frame rail. One of those frame rail bolts is on top of the frame rail, you have to do that one by feel.
Solenoid is super simple, two bolts, and three air lines. As long as you have the air line tool, it is simple. You can probably swap it out in 5 minutes.
Air bags... what a pain. They were by quite a bit the most difficult part. They are held in by one tiny bolt, and a flimsy clip. Disconnecting the air line is super easy. Getting them out of the suspension system is ridiculous. I spent probably 3 hours online trying to find the easiest way to do it, and supposedly the easiest way way to remove the shocks, unfortunately the sway bar, and drop the lower control arm. Right before I started doing that, I decided to try some leverage on the upper control arm to open it up. So, I unbolted the upper shock bolt, then nested a 3lb sledge, with a wedge on one side, on top of the brake caliper, then I took a nearly 3' ratchet to the upper control arm bolt, and then my wife pushed the entire suspension down about 2" with the ratchet. That made enough space to get the air bags in and out without too much trouble. Now that I know how to do it, I can probably swap air bags in less than 30 minutes. If you don't have someone to help you, then you will probably need to drop the lower control arm to get the air bag out.
