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04-20-2013, 07:11 PM
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#1
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Senior Member
Fleetwood Owners Club
Join Date: Nov 2012
Location: Huntley,IL
Posts: 553
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Quick Exhaust Brake Question 2008 Discovery 40X
When I have my Exhaust Brake on and I am slowing down.......are my brake lights on??
I hope this isn't a dumb question but, I don't know of another way to check them other than to ask you guys!! 
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2008 Fleetwood Discovery 40X  "Hognest"
2013 Harley Davidson Ultra Classic Limited
2004 American Ironhorse Texas Choppe
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04-20-2013, 07:20 PM
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#2
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Senior Member
Join Date: Feb 2012
Location: Baton Rouge, LA
Posts: 1,202
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Craig,
That's an excellent question. There seems to be different ways the chassis manufacturers set them up. On ours, the brake lights do not come on when the exhaust brake activates.. Our friend's 2005 Excursion works the same way, but another friend's 2004 Discovery activates the brake lights when the exhaust brake comes on. We have verified this by following each other on the road. i suspect you will have to have smeone follow you to be sure which way your coach works.
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Jim and Lynda, (Sophie, Jake, attack trained killer Shi-Tzus :-))
2003 Fleetwood Expedition 38N 2005 Saturn Vue
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04-21-2013, 06:30 PM
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#3
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Senior Member
Fleetwood Owners Club American Coach Owners Club
Join Date: Mar 2011
Posts: 6,768
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Our rig's brake lights come on when the engine brake is working. I discovered this when driving at night on a deserted road.
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2014 American Eagle 45T
DD 13, 500 HP
Pulling a Honda CRV
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04-21-2013, 06:34 PM
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#4
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Senior Member
Join Date: Apr 2012
Location: Pueblo, CO
Posts: 624
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Ours brake lights come on, just drive at night youwill know about yours for sure just look in camera.
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04-21-2013, 09:02 PM
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#5
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Senior Member
Newmar Owners Club Fleetwood Owners Club
Join Date: Sep 2004
Location: AZ
Posts: 194
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Yes, the 2008 fleetwood 40x turns on the brakelights anytime the exhaust brake engages
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2024 Newmar New Aire
2018 F150 Raptor in tow
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04-22-2013, 06:06 AM
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#6
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Senior Member
Fleetwood Owners Club
Join Date: Dec 2012
Location: Arkansas
Posts: 12,164
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Craig, glad you ask, now I know!
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Tim & Mary Discovery 40X. Jeep GCL RVM32
"I've been lost now, days uncounted..."GFR"
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04-22-2013, 11:15 AM
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#7
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Senior Member
Join Date: Sep 2012
Location: Tasmania now, USA/Canada/Alaska in April
Posts: 2,473
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Another difference between rigs - my cruise control will cause the exhaust brake to come on going downhill and the brake light coming on causes the cruise control to disengage.
Logically, an exhaust brake being operated should activate the brake lights, simply because it is an auxiliary brake but countering that argument is that any gas engine with the throttle off also effectively has an auxiliary brake via the intake so therefore they should also have the brake light on.
Personally I would prefer that it not be on just so those following don't think I'm riding the brake all the way down
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Tony Lee - International Grey Nomad. Picasa Album - Travel Map
RVs. USA - Airstream Cutter; in Australia - MC8 40' DIY Coach conversion & OKA 4x4 MH; in Germany - Hobby Class C; in S America - F350 with 2500 10.6 Bigfoot camper
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04-22-2013, 07:07 PM
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#8
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Senior Member
Fleetwood Owners Club
Join Date: Nov 2012
Location: Huntley,IL
Posts: 553
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Thank You All for your help, I appreciate your input!
Craig 
__________________
2008 Fleetwood Discovery 40X "Hognest"
2013 Harley Davidson Ultra Classic Limited
2004 American Ironhorse Texas Choppe
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04-22-2013, 07:13 PM
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#9
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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On our Dutch Star/Spartan chassis the center brake light comes on if the exhaust brake is turned on and activated, then when I use the service brakes all the brake lights come on.
Also, the exhaust brake activating does not cancel the cruise control like it did on our 2000 Dutch Star/Freightliner with CAT 3126
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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