Cascadia Air leak when building air

2012 Cascadia DD15 the other day I noticed air air leak when the air compressor starts to build air and then once it hits 125 and shoots off the air leak stops? It sounds like it on the front left side of the truck somewhere. I looked sprayed and listened didn’t see anything obvious anyone ever ran into this issue? Any help is appreciated!!!

Happy Holidays!!!

 

A guy just told me it might be my discharge hose like in this video.

any thoughts ??

 

Check the air lines at the air dryer, too.

 

Might also be airline to air tank they have a check valve . You might need to disconnect line at compressor and use shop air to find leak it’s easier than listening over a noisy engine.

 

I think I found it. It’s a braided line tucked behind the frame rail you can see my hand on it in the picture.

 

Just got off the phone with Freightliner they said the hose is on 41 day NATIONAL BACKORDER!

 

Take off that air line and go to a hose shop and see if they can make you one, I'm sure they can though.

 

Yeah I have one by my house gonna take it in the morning. Hose Seems pretty simple to get off. I think I can handle it.

 

Update
Got it fixed pretty easy followed the video. Freightliner wanted 270$ for the hose the hose shop by my house made it in 3 minutes for 104$
7/8th and a 1” wrench got the line off my advice would be a long 7/8th wrench and a short 1” wrench
And I put a piece of hard plastic on the new hose so the frame rail won’t wear through the hose at the same spot.

 

Good deal. Dealerships get you coming and going.