Wabco 1200 air dryer cartridge question

I feel sure dougrainer knows the answer, but, I doubt he will answer you. :h

While no one can tell you for sure if YOUR cartridge needs replacing or not, I can tell you that my owners manual states every 2 to 3 years (no mileage).

dkreuzen wrote:
While no one can tell you for sure if YOUR cartridge needs replacing or not, I can tell you that my owners manual states every 2 to 3 years (no mileage).

thanks and iam very well aware of that;; looking for real world hands on opinion ;;(example) like documented proof the filter fails because of age alone and not water contamination etc
Iam going to change it;; just always looking for a real good reason verses the typical manufactures sell more filter program

Just because you don't operate in damp / humid conditions has nothing to do with the cartridge getting saturated. It has to do with compressed air and the dew point of it.

When you compress air, it raises the dew point (holds more moisture) so the filter pulls that moisture off no matter what the ambient humidity is.

Replace it. It. It's saturated.

SidecarFlip wrote:
Just because you don't operate in damp / humid conditions has nothing to do with the cartridge getting saturated. It has to do with compressed air and the dew point of it.

When you compress air, it raises the dew point (holds more moisture) so the filter pulls that moisture off no matter what the ambient humidity is.

Replace it. It. It's saturated.

thanks for your opinion

hostage wrote:

SidecarFlip wrote:
Just because you don't operate in damp / humid conditions has nothing to do with the cartridge getting saturated. It has to do with compressed air and the dew point of it.

When you compress air, it raises the dew point (holds more moisture) so the filter pulls that moisture off no matter what the ambient humidity is.

Replace it. It. It's saturated.

thanks for your opinion

Not an opinion at all. Fact. I drove and owned a number of over the road trucks and SOP was dryer cartridge replacement. It's very important to pull out the entrained moisture or it will gum up your works down line.

SidecarFlip wrote:

hostage wrote:

SidecarFlip wrote:
Just because you don't operate in damp / humid conditions has nothing to do with the cartridge getting saturated. It has to do with compressed air and the dew point of it.

When you compress air, it raises the dew point (holds more moisture) so the filter pulls that moisture off no matter what the ambient humidity is.

Replace it. It. It's saturated.

thanks for your opinion

Not an opinion at all. Fact. I drove and owned a number of over the road trucks and SOP was dryer cartridge replacement. It's very important to pull out the entrained moisture or it will gum up your works down line.

yes thanks very much and understood but only 29K miles;;; I know my last MH I changed it at 40K miles and after 8 years and the system looked like new that's why iam asking for real life experience and opinions;; what was the mileage on your filters as you were changing them>/?

Just found this by Bendix;;
air dryer cartridge should be replaced every year or 100,000 miles.
For pick up and delivery operations, or for double- and triple-trailer line haul trucks, every two years or 200,000 miles is recommended.
Line haul operations using a single trailer should swap the filter out every three years or 300,000 miles.

hostage wrote:
Just found this by Bendix;;
air dryer cartridge should be replaced every year or 100,000 miles.
For pick up and delivery operations, or for double- and triple-trailer line haul trucks, every two years or 200,000 miles is recommended.
Line haul operations using a single trailer should swap the filter out every three years or 300,000 miles.

so the more use,less you have to change it...motorhome use looks as if it should be changed yearly...I do 17k a year and change every other year

The more the system is used (pressurized and heated, because compressed air is hotter than ambient, the longer the change frequency is). Ocassional use (like a Motorhome) decreases the change interval. Reason being is, when the system drops to no pressure, the entrained water vapor condenses in the lines and when the system is pressureized again, that condensed water vapor winds up in the cartridge... Pretty simple really.