Air Break Sound

[mdlzr]

I have a 2020 Ram Limited 4x4 with all air ride suspension my truck only has 2800 miles on it but two times now once in November and yesterday while the truck is in park and running I get this giant whoosh sound identical to a semi releasing air breaks it scares the hell out of me, went to the dealer and no warning codes or lights. they tell me the bags run on nitrogen so cant be that . Has anyone else had this happen and any ideas thanks.

 

[Hrspwr88]

Happened to me twice also. I assume it's the air ride leveling out but seemed strange to me also.

 

[Checkmate251]

It does it on my 2016 limited with air ride, definitely that!
got to be some kind of relief valve or something similar!

 

[mopar mark]

Mine does it too

 

[Krootz]

Wait...air ride with nitrogen? Seems a little off to me. I recall it being a compressor, as in like “air” compressor. Nitrogen would require a sealed system. I’m curious now

 

[Zoompastu]

Yeah I call BS… I think the dealer rep was mistaken. The dampeners may have nitrogen in them but the air system runs on the same stuff you and I breathe in and out of our lungs

 

[Krootz]

Yeah I call BS… I think the dealer rep was mistaken. The dampeners may have nitrogen in them but the air system runs on the same stuff you and I breathe in and out of our lungs

Yeah, nitrogen would be overly complicated and expensive for an air ride setup. It’s got to be an air compressor system...and those ALWAYS have a pressure release valve that activates at a set PSI to keep from popping the bags.

 

[Ride2little]

I have the air ride susp and have never heard such a noise. The compressor seems to run for both raising and lowering. No big air release ever.
Keep in mind that there is no air tank or reservoir other than the bags themselves.
Not sure what you have going on there.

 

[Krootz]

OK, so if the system uses the bags as the “reservoir” there could still be an emergency release valve that gets triggered at a certain PSI. I’m just offering up possibilities, I’m curious to find out what is really going on though. I can’t find anything online and mine doesn’t have air bags.

 

[jasnak]

Wait...air ride with nitrogen? Seems a little off to me. I recall it being a compressor, as in like “air” compressor. Nitrogen would require a sealed system. I’m curious now

It is a nitrogen filled system and compressed air. So a compressed air pump builds pressure and pushes a pistion to build pressure on the nitrogen side then to the airbags. Nitrogen doesn’t heat or expand as quickly as air is y they use it for 1/2 the truck. Aka heat from suspension movement

 

[Fatherof3]

My 2016 Rebel used to do that every now and then , it does a self test and then releases the air out with a big ..... ( can’t really describe it ) other than the air brakes on a semi .

 

[jasnak]

My 2016 Rebel used to do that every now and then , it does a self test and then releases the air out with a big ..... ( can’t really describe it ) other than the air brakes on a semi .

It will be an air drier. Captures the moisture on the air side and blows it out the bottom of the air drier once in awhile.

 

[2019REBEL]

I have the air ride susp and have never heard such a noise. The compressor seems to run for both raising and lowering. No big air release ever.
Keep in mind that there is no air tank or reservoir other than the bags themselves.
Not sure what you have going on there.

There are 2 tanks under the bed.

 

[392DCGC]

Yeah I call BS… I think the dealer rep was mistaken. The dampeners may have nitrogen in them but the air system runs on the same stuff you and I breathe in and out of our lungs

Yeah, nitrogen would be overly complicated and expensive for an air ride setup. It’s got to be an air compressor system...and those ALWAYS have a pressure release valve that activates at a set PSI to keep from popping the bags.

I have the air ride susp and have never heard such a noise. The compressor seems to run for both raising and lowering. No big air release ever.
Keep in mind that there is no air tank or reservoir other than the bags themselves.
Not sure what you have going on there.

Modern air suspensions do not use air from the atmosphere - this would lead to condensation issues, and air is too temperature sensitive. They are SEALED nitrogen systems with reservoir tanks. Yes there is a compressor but that is needed to get the nitrogen in and out of the tank.

 

[Krootz]

Oh I get it. It’s both. Air compressor drives a piston that pushes nitrogen into the bags. The air release is either to purge air/moisture or whatever and the sealed system is unaffected. If that is in fact what’s going on here, still sounds overly complicated.

Does anyone have a diagram or visual reference of this “air-to-nitrogen” system? I’m super interested in this now

 

[2019REBEL]

Oh I get it. It’s both. Air compressor drives a piston that pushes nitrogen into the bags. The air release is either to purge air/moisture or whatever and the sealed system is unaffected. If that is in fact what’s going on here, still sounds overly complicated.

Does anyone have a diagram or visual reference of this “air-to-nitrogen” system? I’m super interested in this now

See my pic of how it is laid out in post 13.

 

[Krootz]

I saw that, I was looking for a graphic of how the air compressor interacts with the sealed nitrogen system. Just curious how it works together

 

[kapinallinen2]

I saw that, I was looking for a graphic of how the air compressor interacts with the sealed nitrogen system. Just curious how it works together

Forget everything about "air" It is a sealed system using a nitrogen compressor pumping nitrogen from 2 tanks to the bags and back.
And that's it, no air in the system.

 

[Ram41313]

This has happened to me on my 2020 limited a few times

 

[jerryw1000]

Heard it on my 2020 Laramie 2500 yesterday for the first time. I had just turned it off and heard the "whish" as I opened the door to get out. Sounded like the moisture ejectors on an air brake system.