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Possible Coach Air System Problem


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26 replies to this topic

#1 Trabuco

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Posted 22 November 2011 - 05:37 PM

Not sure if I have a problem or not with the compressed air system on my 2005 Monaco Diplomat. I put the RV in storage about 7 days ago and went over today to do a little work on the unit. The air gauge on the dash is reading about 50 psi. All the air is out of the air bags and the coach is sitting down.

When I start the coach the pressure comes right up no problem.

This is the second time I have noticed this happening. My question, is this normal or do I have a potential leak?

The coach is new to me so I'm not sure if this is normal or not.
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Ken & Roxanne
2005 Diplomat
Trabuco Canyon, CA

#2 wolfe10

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Posted 22 November 2011 - 05:46 PM

Is that rate of leakage acceptable per DOT and industry standards-- yes.

Is it possible with soap and water and small brush or "kiddie bubble" solution that you could find a small leak-- yes.

If you go under the coach to look for the problem, be sure to use safety stands.
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Dianne and Brett Wolfe
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#3 Trabuco

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Posted 22 November 2011 - 05:50 PM

Thanks Brett - that was quick, you're right on top of this stuff! I'll keep an eye on the situation and see if the frequency increases.
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Ken & Roxanne
2005 Diplomat
Trabuco Canyon, CA

#4 wolfe10

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Posted 22 November 2011 - 06:02 PM

Yup, just got back from doing some work on the sailboat.

If you don't already have a copy, here is an air brake system check:



Air Brake System Pre-trip Check




1. Be on reasonably level ground. Block wheels so the coach can not move even with the parking brake off.

2. Start engine and run until full air pressure is reached. Listen for the dryer to purge (about 120 PSI).

3. Shut off the engine.

4. Release the parking brake by pushing in the yellow button (make sure you don't roll, and do NOT apply the brake pedal).

5. After the initial pressure drop, the system should not loose more than 2 PSI per minute.

6. Apply the brake pedal firmly (still with the parking brake OFF).

7. After the initial pressure drop, the system should not loose any more than 3 PSI per minute.

8. With the engine off, ignition on and parking brake off, rapidly pump the brake pedal to bleed down the air supply. During this stage you should watch for the warning light and buzzer at about 60 PSI and then the yellow button (parking brake) should pop out at about 30 PSI.

9. Restart the engine and build up air pressure again. While building up pressure, check how long it takes for pressure to go from 85 to 100 PSI at “cruising RPM”. It should be less than 45 seconds.
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Dianne and Brett Wolfe
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#5 Trabuco

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Posted 22 November 2011 - 06:15 PM

I do not have copy of the brake check - thank you!
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Ken & Roxanne
2005 Diplomat
Trabuco Canyon, CA

#6 TBUTLER

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Posted 22 November 2011 - 09:18 PM

Does the coach have jacks for leveling or is it an air bag leveling system? Our coach levels with air bags. Once the coach is leveled, the air bags will hold air fairly well while the brake side of the system bleeds air down to zero. If we have power, there is a small compressor which maintains the leveling system in active mode, keeping the coach level indefinitely. All the while the brake side of the system and thus the dash gauge are bleeding down to zero.
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Tom and Louise Butler
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After 9 1/2 years full time in our motor home and being Winter Texans we are now living at Sandpipers Resort in Edinburg, Texas. Now we are Summer Chickens!

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#7 Trabuco

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Posted 22 November 2011 - 09:26 PM

No air leveling just hydraulic jacks. I just purchased the coach about a month ago and have not learned all it's little quirks. I'll keep a little closer eye on it and do as Brett suggested and put a little soap on a few of the fittings and see where that leads.
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Ken & Roxanne
2005 Diplomat
Trabuco Canyon, CA

#8 Guest_Wayne77590_*

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Posted 23 November 2011 - 12:13 PM

With Brett's help, the culprit on my 2008 was the line going to the dash gauge. The gauge itself had to be replaced. So don't overlook the little areas when checking for bubbles.

#9 Trabuco

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Posted 23 November 2011 - 08:52 PM

Thanks Wayne I'll keep the gauge in mind.
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Ken & Roxanne
2005 Diplomat
Trabuco Canyon, CA

#10 tstarling

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Posted 02 February 2012 - 06:50 PM

Why would the front air gauge fluctuate from 0 to 130 and low air warning light go off on diesel motorhome. It corrects itself after a couple of minutes and the gauge goes back to normal. It recurs again sometimes a minute later and sometimes an hour later.

Thanks, Thurmond Starling
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#11 wolfe10

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Posted 02 February 2012 - 06:55 PM

Why would the front air gauge fluctuate from 0 to 130 and low air warning light go off on diesel motorhome. It corrects itself after a couple of minutes and the gauge goes back to normal. It recurs again sometimes a minute later and sometimes an hour later.

Thanks, Thurmond Starling


What chassis? Your chassis maker fit your gauges and air pressure senders, so that is your first point of contact.
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Dianne and Brett Wolfe
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#12 tstarling

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Posted 02 February 2012 - 07:10 PM

It is a 2001 Bounder on a Freightliner XC Chassis.
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#13 DickandLois

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Posted 02 February 2012 - 11:36 PM

The VDU module is causing the problem. Fleetwood / Freightliner generally located under the doghouse curb side. They have a cold solder connection issue.
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#14 tstarling

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Posted 03 February 2012 - 03:01 PM

Thanks, I have an appointment next Thursday wFreightliner. I will pass this on.
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#15 tstarling

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Posted 09 February 2012 - 09:48 PM

Returned from Freightliner with a new VDC board and $1,088 less money. Does anyone have a schematic
or instructions for repairing the old board? Be nice to have a spare as I kept the old board.

Thanks, Thurmond, 2001 Freightliner XC chasis
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#16 DickandLois

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Posted 10 February 2012 - 07:00 AM

Thurmond, Send me a PM with your contact information and I will send you what info. I have.

R.M.
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#17 tstarling

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Posted 10 February 2012 - 10:12 AM

Hi ****, Not sure what a PM is but I assume it is my e-mail address.

It is tkstarling@northstate.net
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#18 hermanmullins

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Posted 10 February 2012 - 11:20 AM

tstarling,

Welcome to the Forum.

PM=Personal Message. Click on ***** name and when his profile comes up click on send a message.
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#19 DickandLois

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Posted 12 February 2012 - 02:57 PM

Thurmond,

From your response it sound like you have a handle on the problem.

Thing is if you never need to use the repaired module it might make a good ebay item or item to list for sale at a Rally.

R.M.
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#20 Ronjay39

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Posted 19 January 2013 - 11:06 AM

How do you repair the cold solder joint?

Any info would be helpful.

Thanks.
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