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05-13-2019, 08:17 AM
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#1
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Senior Member
Newmar Owners Club
Join Date: Apr 2016
Location: Carefree, AZ
Posts: 620
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SMI Air Force One stopped working
We've had our Air Force One installed for three years and it's been working flawlessly until now. The brake at the toad is no longer being applied when I step on the coach brake - confirmed by my wife sitting in the Jeep when we tested the brake. I swapped the hose between the coach and the Jeep, same result. I don't hear any leak coming from the system.
Any suggestion what I should check next
2016 Newmar Dutchstar and 2016 Jeep Grand Cherokee.
__________________
Juergen & Margit
2016 Newmar DS 4018
2016 Jeep GC Limited
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05-13-2019, 08:26 AM
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#2
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Senior Member
Join Date: Aug 2015
Posts: 6,972
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Juergen-
A question: If you arm the system and pull the breakaway pin, does it move the cylinder attached to the brake pedal?
If not: Is the cable from the cylinder still attached to the firewall?
__________________
Mark
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport
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05-13-2019, 08:30 AM
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#3
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Senior Member
Newmar Owners Club Freightliner Owners Club Spartan Chassis
Join Date: Apr 2012
Location: ON THE ROAD...SOMEWHERE
Posts: 6,973
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Quote:
Originally Posted by l1v3fr33ord1
Juergen-
A question: If you arm the system and pull the breakaway pin, does it move the cylinder attached to the brake pedal?
If not: Is the cable from the cylinder still attached to the firewall?
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I had something similar a few years ago where the cable in the cylinder broke. I had an older actuator that the opening where th cable entered the actuator had a sharp edge. It has since been replaced with one that has a rounded edge. Still, it is important to make sure you have the straightest line between the firewall anchor and actuator to avoid the cable rubbing on the actuator.
BTW...I also had the first one wiggle out of the firewall anchor too.
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Don, Sandee & GSD Zeus. Guardian GSDs Gunny (7/11/15) & Thor (5/5/15)
2006 2015 DSDP 4320 4369, FL Chassis, 2013 CR-V 2020 Jeep Overland, Blue Ox Avail, SMI AF1.
[SIGPIC][/SIGPIC]
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05-13-2019, 08:40 AM
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#4
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Jun 2008
Location: Glendora Ca.
Posts: 1,589
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After the second cable broke I bought better cable from McMaster-Carr.
Mike
__________________
2004 Monaco Monarch
Blueox, SMI, 1990 Wrangler YJ
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05-13-2019, 08:59 AM
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#5
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Senior Member
Newmar Owners Club
Join Date: Apr 2016
Location: Carefree, AZ
Posts: 620
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Quote:
Originally Posted by l1v3fr33ord1
Juergen-
A question: If you arm the system and pull the breakaway pin, does it move the cylinder attached to the brake pedal?
If not: Is the cable from the cylinder still attached to the firewall?
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Great suggestion. When I pull the pin the brake slams shut, which means the system on the Jeep side is being charged. Right? The connection to the brake cylinder is not broken and seems solid. Maybe my brake cylinder went bad?
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Juergen & Margit
2016 Newmar DS 4018
2016 Jeep GC Limited
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05-13-2019, 09:09 AM
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#6
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Jun 2008
Location: Glendora Ca.
Posts: 1,589
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Remember It does not work at a stand still.
Mike
__________________
2004 Monaco Monarch
Blueox, SMI, 1990 Wrangler YJ
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05-13-2019, 11:11 AM
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#7
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Senior Member
Newmar Owners Club
Join Date: Apr 2016
Location: Carefree, AZ
Posts: 620
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Quote:
Originally Posted by mfire1339
Remember It does not work at a stand still.
Mike
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Wow, I never knew this. I would have sworn that it worked before at stand still. Guess, I need to have my wife in the toad diving a short distance. Thank you.
__________________
Juergen & Margit
2016 Newmar DS 4018
2016 Jeep GC Limited
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05-13-2019, 12:48 PM
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#8
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Moderator Emeritus
Newmar Owners Club
Join Date: Apr 2014
Location: Southern Indiana
Posts: 19,417
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SMI Air Force One stopped working
Mine worked just fine at a stand still.
Just need coach aired up.
I have also tested mine by using air blow gun and applying air to fitting on toad.
__________________
Steve
2002 Newmar Mountain Aire 4095
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05-13-2019, 04:31 PM
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#9
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Senior Member
Newmar Owners Club
Join Date: Apr 2016
Location: Carefree, AZ
Posts: 620
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Did some more probing The coach side seems to be fine. I can feel air coming out of the fitting at the back of the coach when the brakes in the coach are being applied.
I tried to use a compressor nozzle on the Jeep side but it doesn't seem to have any impact at all.
I'm trying to find an installer now near Las Cruces, NM. The local guy here can't get me in at all this month. I might just have to wait until we're in Albuquerque to get it fixed.
Anyway, thanks to everyone for your suggestions. It helped to further diagnose the problem.
__________________
Juergen & Margit
2016 Newmar DS 4018
2016 Jeep GC Limited
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05-14-2019, 07:14 PM
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#10
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Senior Member
Join Date: Sep 2009
Location: Central Indiana
Posts: 1,422
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I think Demco now is the manufacturer/supplier of Air Force One. I just bought some parts from them. They were knowledgeable and responsive. Suggest you call them. 712-725-2311 or 800-543-3626. Maybe they can walk you some quick tests to isolate the problem component
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05-16-2019, 06:21 AM
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#11
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Senior Member
Freightliner Owners Club
Join Date: Apr 2004
Location: Show Low Az
Posts: 1,325
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Quote:
Originally Posted by mrboyer
I think Demco now is the manufacturer/supplier of Air Force One. I just bought some parts from them. They were knowledgeable and responsive. Suggest you call them. 712-725-2311 or 800-543-3626. Maybe they can walk you some quick tests to isolate the problem component
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Yea best answer - Call Tech Support
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Dale&Susan, 08 Alfa Gold, DaGirlsRv Blog
2015 F-150XLT_2000W Solar_800 AmpHr Lithium
Magnum_MSH 3012 & PT100
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