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Old 08-15-2018, 07:34 AM   #1
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Anyone know what this valve is? It is on the frame street side, behind the tear axle.

https://photos.app.goo.gl/Zxn3axubFmBoCpMz6
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Old 08-15-2018, 11:14 AM   #2
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Are those air hoses?
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Old 08-15-2018, 11:27 AM   #3
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trace the hoses.
My first guess is that your looking at the tag air bag dump valve.
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Old 08-16-2018, 02:29 AM   #4
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Yes, they are air lines.
No, this unit does not have a tag axle.

Wonder if someone at Monaco can help?
Might try calling tomorrow.

Thank You
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Old 08-17-2018, 07:03 AM   #5
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Is it the governor?
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Old 08-17-2018, 09:56 AM   #6
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Im not able to see it very well but it looks like the inversion valve, is it on the driver side frame rail.
What is your problem with it?
Well finaly got to see all the picture and it is not the inverson valve and not on the main frame also it is not the the dump valve or governor.
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Old 08-17-2018, 11:27 AM   #7
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Could be the rear air brake relay valve ?
You need to trace where the lines go.
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Old 08-17-2018, 11:35 AM   #8
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You have my curiosity peaked.
I was looking at various valves on-line - didn't see that exact valve but found two that are similar.
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Old 08-18-2018, 05:58 AM   #9
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That top one looks like it is a match, mine just has a different top with a line.
Where did you find it, & what does it do?
It is fed when you release the parking brake, & was leaking out that vent cap near the bottom. To make it stop leaking air to pass state inspection, I took out the vent, & put a plug in the hole. Both the leveling system & brake release work fine with it plugged, but now that I passed inspection, I want to properly address it.

Thanks!
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Old 08-18-2018, 07:50 AM   #10
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This might help, if you are looking for a repair kit, or replacement. Is there a tag on one of the bolt on the top of the Inversion valve with numbers on it?

https://www.haldex.com/en/North-Amer...nversion+Valve

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Old 08-18-2018, 07:51 AM   #11
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Inversion valve - like Walt said. This is great place to buy parts and compare parts by looks:

https://www.anythingtruck.com/catego...inversion.html
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Old 08-18-2018, 08:22 AM   #12
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I found this to be very informative as I was new to air brakes and their function.

air-brakes-how-they-work
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Old 08-18-2018, 03:52 PM   #13
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There is a tag on one of the top bolts, will possibly see if I can get that one bolt out to get the tag off, then put bolt back. I don't want to remove the valve at this time, as I am in the process of making the pad where it will live bigger, & need to move it for the concrete truck next week.
What does an inversion valve do? I think it is in the air ride/ leveling system vs the brake system, but not sure. I used to work on air brake systems 25+ years ago, but they were much simpler back then.

I appreciate the help!
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Old 08-18-2018, 05:15 PM   #14
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The inversion valve senses the loss of air in the primary system, allowing the spring brakes on the rear axle to be applied or released in a modulated manner at the same time the front service brakes are applied or released by the operator. The inversion valve also permits air pressure to enter the parking brake chamber, releasing the spring brakes.

The inversion valve is not required on tractor applications due to the fact that the trailer brakes, being supplied with air from both the primary and secondary tractor systems, provide necessary braking required to meet FMVSS 121 emergency stopping requirements.
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