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Old 07-29-2014, 09:30 PM   #1
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Front/rear air gauges

My front air gauge will drop below 65 in less than a day or so while the rear gauge will stay above 100 for several days.
What does the front gauge indicate so I know what/where to look for a possible leak? My coach is a 2004 Meridian 36G on the Freightliner XC chassis.
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Old 07-29-2014, 11:22 PM   #2
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Could be your front tank feeds the air suspension, mine does , 65 psi is the shut off for the brake saver; keeps enough air in the tanks to operate the air brakes if an air bag( spring ) ruptures.
My XC, the front air suspension will vent to re-level every time I step off the steps , so if your in & out of the coach often , the front suspension will bleed the air down, and that's normal. If the air goes down and you've only been out & in once you have a leak.
I'd put in a call to Freightliner Help line and ask for an air system diagram.
I'd forward you mine but there could be changes in the 6 years between them.
1-800-385-4357, have your serial number handy.
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Old 07-30-2014, 06:14 PM   #3
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Quote:
Originally Posted by wagonmaster2 View Post
My front air gauge will drop below 65 in less than a day or so while the rear gauge will stay above 100 for several days.
What does the front gauge indicate so I know what/where to look for a possible leak? My coach is a 2004 Meridian 36G on the Freightliner XC chassis.
wagonmaster2,
There's lots of potential areas for your leak. It could even be coming from the connection to the back of what's called the "MMDC". That's the main Multi-Module-Data-Computer that receives information from many aspects of your engine, transmission, and ABS system and, your front and rear air systems are plumbed into it too. It's just one of many places that could be your issue. Chasing down air leaks can be a real pain in the neck.

Our coach is very close to being a sister ship to yours. It's the '04 Itasca Horizon, 36"GD" with the C-7 330 HP CAT. I do have the air system schematic for it. I will try and attempt to link it to here. Not sure if it will work but, I'll give it a try.
Scott
Attached Files
File Type: pdf Air System.pdf (122.0 KB, 123 views)
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Old 07-30-2014, 07:11 PM   #4
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Thanks for that link, it came out just fine. This is going to take some studying since I retired as an accountant not an engineer. But it certainly looks like it's going to be a big help. Appreciate it.
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Old 09-14-2014, 11:38 PM   #5
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I had a similar problem in my 07 Vectra.. turned out to be a cracked gauge plastic housing in the dash. Replaced to the tune of $1000.00 give or take... over $900 for the gauge assembly itself.
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