m923 Air leak

[glivdub03]

I own a m923a1, when I turn the truck off there is a slight air leak coming from behind the front bumper. It is very hard to hear unless you are close to it. Has anyone come across this problem before? Thanks for the help!

 

[doghead]

Fan clutch.

 

[juanprado]

there is also an air brake valve in that vicinity of the bumber on the inner frame. Don't recall offhand maybe a relay or quick release.

 

[glivdub03]

the leak is more toward the driver side frame rail behind the bumper.

 

[glivdub03]

there is also an air brake valve in that vicinity of the bumber on the inner frame. Don't recall offhand maybe a relay or quick release.

I will take a look at that this weekend, what does the air brake valve look like? what size is it? Thanks!

 

[juanprado]

look at the attached screen shot from the p2p software.

It is available here on ss. Look at the sticky on the top of the 5 ton forum.

 

[glivdub03]

Thanks!! You have been very helpful!

 

[dmetalmiki]

You might check to glad hand one way valves (towing input lines) As they are mounted close to the location you feel is the source.

 

[glivdub03]

You might check to glad hand one way valves (towing input lines) As they are mounted close to the location you feel is the source.

Thanks! I will check that as well! Are the fittings on the truck are they SAE thread or pipe thread? Thanks again for all the help

 

[juanprado]

Bolts and fasteners are fine thread for the most part. Most plumbing (air, oil, water ) is pipe thread. Some of the assembled hoses assemblies are JIC.

The glad hands and valves are pipe thread.

Not sure if I answered your question?

 

[glivdub03]

Bolts and fasteners are fine thread for the most part. Most plumbing (air, oil, water ) is pipe thread. Some of the assembled hoses assemblies are JIC.

The glad hands and valves are pipe thread.

Not sure if I answered your question?

You have Thank you Sir!

 

[glivdub03]

Will post my findings this weekend

 

[glivdub03]

looked at the air brake valve and it is not leaking, the leak is coming from that area just a little bit higher. I will check the fan clutch any other ideas? Thanks!