Fitting UAS air suspension to a 300c - 300cforums.com.au

Left Solenoid lets the airbag down and the solenoie on the right inflates the bag.

Valve labelled 1 in the image goes to the airbag

Valve labelled 2 in the image takes a line from the tank

Rear airbag assembled.

1. bottom of the airbag. This bolts to the lower control arm (bottom seat for rear spring).

2. air hose connects here

To remove the rear shocks and springs you will need to undo most of the rear suspension as the self levelling shocks won't budge from their preset height.

See the image on the left for which bolts to undo.

I found that I had to back off the nuts on the other end of each of the suspension arms (bushes in them are really tight).

The image marked with the 1. indicates the other end of the torsion bar. You can either undo the bolt maked by the 1. or the bolt indicated on the first image (top left <--- ).

NOTE - be sure to make sure when you undo the swing arm bolts that the brakelines are NOT taking the weight of the rotor or anything, either loosen the bracket holding up the brake line or use a jack to stop the suspension dropping..

Once these bolts are undone, undo the bottom of the strut, and the two bolts on the top that bolt it to the body.

Your strut and spring should come out quite easily now.

Place your rear bag in the spring mount (without the rubber inserts the spring).

Direct the bags valve to the rear of the car (1. i nthe image). As the best place to mount your solenoids to fill and deflate the bag is where the 2. is in the image. Bolt up the bottom of your bag and put your new strut in. Then just do up all the bolts (remember to use some threadlock).

Before you put your rear shock in, you will need to remove the bumpstop. If you don't then your car will not sit flat when the bags are fully deflated.

The bumpstop is located under the plastic collar of the rear strut. To get at it, you will need to undo the bolt ontop of the strut (see top left image).

Take the bumpstop out completely and bolt the top back on your strut.

Once the bump stop is removed, bolt your strut back in.

Now your rear bags should be sitting in ready for airlines and wiring.

Removing the front struts is alot easier and faster than the rear.

Simply undo and remove the bolt on the bottom of the strut (see top left image) and then undo the 3 nuts on your strut tower (bottom left image).

To avoid having to remove/split the ball joints, push down on the rotor and get someone else to slip the strut out.

Installing the bag is very simple. Slide the bag over your strut (making sure the air line lines up with the hole you cut in the bottom spring plate.

The top of your stock strut (spring holder) is used ontop of the strut towers as pictured bottom left. Tighten up the 3 nuts and then tighten up the top of the shock (see image bottom left).

Bolt the bottom of your strut in and your front airbags are now installed and ready to go.

On the rear crossmember you will see a bracket for the handbrke cable. I found this was the easiest method to attach the bracket for the rear height sensors.

Bolt the bracket on, then weld it to the crossmember.

Next you will need to weld a small bracket onto the lower control arm (see bottom left image).

Next is to attach your height sensor, bolt it to your bracket on the crossmember.

Remember when putting the height sensors in that they need to have atleast 2" (~50mm) of movement between fully inflated and deflated. Also the range of motion for the sensors is 90degrees - best bet is to see the instructions.

Weld a small bracket onto the pivot for your front swaybar (see image topleft).

Front sensor is simply screwed into the chassis rail (see bottom and middle left images).

The aim is to install the solenoids in a spot where they will sit behind the inner guard and able to get the airlines to them easily.

The best position is the back of the inner front guard (see top left image). Position the solenoid as is shown in the image (bottom left).

1. marked on the image is where the airline from the tank is fitted.

2. on the image is the fitting used to connect to the front bag.

The aim is to install the solenoids in a spot where they will sit behind the inner guard and able to get the airlines to them easily.

The best position is the back of the inner front guard (see top left image). Position the solenoid as is shown in the image (bottom left).

1.on the image is the fitting used to connect to the rear bag.

2. marked on the image is where the airline from the tank is fitted.

Running the airlines is a fairly simple procedure. Just be sure to attach and secure the hose properly.

Cut your hose square and push it all the way into the fitting (2. in image). Then hold the hose in and pull back the collar(1. in image).

To remove the hose, push the collar(1.) towards the fitting(2.) and pull the hose out.

Check out the document put together by UAS on the plumbing of all airlines (linked below)

Airhose plumbing

NOTE - the airline used is 1/2" air hose that is standard in trucks. So if you run out, go to your local truck parts supplier and take a bit of hose to show them what you want. It's only about $5 per metre.

Each solenoid has a relay to actuate the solenoid.

If you look on the bottom of the relay, there is a diagram that shows 3 pins. Do NOT use the pin that is marked as earth on the bottom of the relay.

Use the two remaining pins - ground one and power the other (it doesn't matter which is ground or power).

The power you use is the wiring loom provided with the kit.

There are two bolts inside the boot (see image to the left). These are located just next to the rear tail lights. Then there are 5 scrivets along the top of the bumper (near boot/trunk lid).

The bumper will slide back then off, on the right hand corner there is a wiring loom that needs to be disconnected, then the bumper is ready to be taken completely off.