Rear air bag pressure

The best way to set it up first off is, pump air bags to max. pressure, usually around 35psi, then load the vehicle, hook up the camper & then lower the pressure until it is level.

Gday Kim,
I got mine fitted a while ago.
I assumed they knew what they were doing and left them at that.
When my car sagged..I pumped them up.
As long as my beer doesnt roll off the dash I reckon they are working fine.
Take the latte machine out of the back and it will probably level out again?


Hahahahahhaha


Cheers

Hi Kim

I think different air bags run at different pressures. For example my air bags which are the type that sit over the leaf springs have a rating of up to 200psi. My air tank has a limit switch at 140psi.

Usually fully loaded I run around 80 to 120 psi. And I will put the loaded camper on the back of the ute and then pump the air bags up. The advertising for my air bags said they tested them to 700psi with no issue and stopped there as they felt it was getting dangerous.

I have heard other airbags - different types - will only pump to 40 ~ psi.

I think you need to consult the instructions or look on the website for your type of airbags. Or tell us what type and maybe someone has the same brand.

David

The red Polyair airbags have a max pressure of 30lb according to the fitting instructions.


Anything with a heavy ballweight would benefit far more from a WDH as airbags do not substitute for one of them.

They do not and cannot allow the weight removed from the front axle by hooking up the trailer to return, simply by pumping them up harder.

All they do is lift the rear higher.

Quote As a secondary thought I asked them to pump the air bags up to 25 PSI. This certainly raised the rear end of the car, but I’ve yet to test it with a load on the hitch. quote

If I were you I would learn quite a bit more about your vehicle. You should also get a pump ( and Polyair gauge) as to drive around with Polyairs or similar at 25PSI unladen is IMHO very uncomfortable and maybe dangerous as it will vastly increase the roll stiffness at the back.

Polyair type bags are rated to lift 450Kgs, so should easily accommodate any reasonable towball weight at much less than that pressure.

AFAIK , the correct procedure measure the height of the rear , pump up the bags, apply the load , then let down the bags until the height is the same as unladen. Few of us do that , but it only really has to be done once.

Do you also get the dealer to check your tyres???

Regards Philip A