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12-10-2007, 06:03 AM
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#1
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Junior Member
Join Date: Mar 2007
Location: Full Time
Posts: 3
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Our air brake guages will jump from normal readings to zero and then to maximum at any time. The warning buzzer also sounds. First happened 10 mo ago and pulled off road to check. Shut down, looked under, pull lanyards, restarted and no furthur alarms. Happened again next day, stopped and returned to normal before we could stop. Convinced it is not pressure failure! Need to know where sensors are located, grounded, etc. If we get close to Freightliner, it will not do it. Anyone else?
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12-10-2007, 06:03 AM
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#2
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Junior Member
Join Date: Mar 2007
Location: Full Time
Posts: 3
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Our air brake guages will jump from normal readings to zero and then to maximum at any time. The warning buzzer also sounds. First happened 10 mo ago and pulled off road to check. Shut down, looked under, pull lanyards, restarted and no furthur alarms. Happened again next day, stopped and returned to normal before we could stop. Convinced it is not pressure failure! Need to know where sensors are located, grounded, etc. If we get close to Freightliner, it will not do it. Anyone else?
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12-10-2007, 07:37 AM
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#3
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Moderator Emeritus
Nor'easters Club Workhorse Chassis Owner iRV2 No Limits Club
Join Date: Oct 2004
Posts: 30,785
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Welcome Bob & CJ to irv2.
Can't help but will short cut question to FL Forum for more exposure.
Enjoy the forums and do post often.
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12-10-2007, 05:57 PM
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#4
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Senior Member
Join Date: Jul 2006
Location: Mobile, Alabama
Posts: 1,002
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My Spartan front air gauge has done it off and on...replaced the gauge and seemed ok for 5 months then went nutz last weekend...from 65 with warning buzzer to 150 with high pressure red light..all within 15 seconds....happened about 20 times each way in a 150 mile trip....Spartan says it MAY be a software issue...need to verify Firmware version tomorrow..if not, then some sort of wiring or sender problem....big PIA
__________________
2006 Mountain Aire 43 and 05 Honda Pilot
Air Force One..Real Whirlpool Fridge !
3 sugar gliders, long hair daschund and short hair wife for security
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12-11-2007, 03:18 AM
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#5
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Moderator Emeritus
Join Date: Jan 2000
Location: West Palm Beach, FL. USA
Posts: 27,519
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The zero-full cycle is the start up sequence and happens whenever power comes on. My guess is that you have a loose power or ground wire in the dash and the gauge is losing power and coming back on, going through its reset cycle.
__________________
Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is West Palm Beach, FL
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12-14-2007, 06:13 AM
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#6
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Junior Member
Join Date: Mar 2007
Location: Full Time
Posts: 3
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by RV Roamer:
The zero-full cycle is the start up sequence and happens whenever power comes on. My guess is that you have a loose power or ground wire in the dash and the gauge is losing power and coming back on, going through its reset cycle. </div></BLOCKQUOTE>
Thank you Gary. I've been behind dash checked wires and flipped the disc over in the buzzer.(less noise) Need to trace wires to tanks or wherever sensors are located. Some WABCO plumbing near center, but marked L and R.
Will try this week end
Bob
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12-14-2007, 01:50 PM
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#7
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Senior Member
Join Date: Apr 2003
Location: Oakton, Va
Posts: 1,160
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If your Freightliner is like mine the air tubes go from the two tanks to the vehicle dash controller (VDC). There the pressure is converted to a digital signal and sent to the dash gauges. You should swap the connector on the bad dash gauge with another gauge to see if that eliminates the problem. If so then you have a bad connector. If you are having trouble with only one gauge I suspect you have the problem I had off and on for a year, and that was a bad VDC. I took it to Gaffney and they replaced it and ended the porblem.
__________________
Jim Walker
N Virginia
2014 Palazzo 33.2
Cummins 6.7 ISB, Allison 2100 6 Speed
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01-06-2008, 06:33 PM
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#8
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Senior Member
Winnebago Owners Club
Join Date: Jun 2007
Location: Charlton, NY
Posts: 523
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I have the same problem - see my low air alarm post - how much to replace a VDC - my 2002 Itasca is out of warranty, but I do have CSP.
__________________
2002 Itasca Horizon 34HD FL XC Chassis/CAT 3126 330HP, 2005 Ford Explorer, Falcon II bar, ReadyBreak, BlueOx.
More Toads: 6x12 enclosed, Beta 200 RR RE, Regal LSR 2100
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01-07-2008, 08:43 PM
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#9
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Junior Member
Join Date: Sep 2002
Location: Yorba Linda,CA
Posts: 8
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I had the same problem with erratic air pressure gauges while driving, finally had the VDC replaced. Parts cost was $450 plus an hour of labor @ $95/hr. On my 2001 Freightliner XCS the VDC is in the engine compartment under the bed mounted on the support crossmember. You have to remove the mattress and unscrew the bed platform and remove the back engine compartment cover to get to the VDC on my chassis.
__________________
Mark & Robin
2001 Winnebago Journey 36L
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07-01-2008, 05:33 PM
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#10
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Senior Member
Winnebago Owners Club
Join Date: Jun 2007
Location: Charlton, NY
Posts: 523
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How did you disconnect the darn buzzer? My problem with this air alarm persists on this 5000 mile trip I'm on and I know it is the sensor on the VDC. So how do you deal with the buzzer - where is it under the dash or a simple buzzer fuse?
__________________
2002 Itasca Horizon 34HD FL XC Chassis/CAT 3126 330HP, 2005 Ford Explorer, Falcon II bar, ReadyBreak, BlueOx.
More Toads: 6x12 enclosed, Beta 200 RR RE, Regal LSR 2100
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07-01-2008, 05:46 PM
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#11
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Feb 2008
Location: Pensacola, Florida
Posts: 5,173
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">the VDC is in the engine compartment under the bed mounted on the support crossmember. You have to remove the mattress and unscrew the bed platform and remove the back engine compartment cover to get to the VDC on my chassis. </div></BLOCKQUOTE>
You have to wonder sometimes if the design engineers are brain damaged.
__________________
Travel well, travel safe,
Jim
2006 Tiffin Phaeton - 2011 Cadillac SRX
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07-02-2008, 02:39 PM
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#12
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Senior Member
Winnebago Owners Club
Join Date: Jun 2007
Location: Charlton, NY
Posts: 523
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by historyljc:
You have to wonder sometimes if the design engineers are brain damaged. </div></BLOCKQUOTE>
Right!....The dash controller is on top of the engine, the engine controller is in the dash...
__________________
2002 Itasca Horizon 34HD FL XC Chassis/CAT 3126 330HP, 2005 Ford Explorer, Falcon II bar, ReadyBreak, BlueOx.
More Toads: 6x12 enclosed, Beta 200 RR RE, Regal LSR 2100
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