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05-06-2023, 11:11 AM
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#1
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Senior Member
Join Date: Aug 2017
Location: St. Louis, MO
Posts: 739
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Motorhome - Exhaust Brake - Noise - Posted NO ENGINE BRAKE - Does this apply to RVs?
2008 Tiffin Phaeton 40' DP Motorhome Freightliner XC chassis
Cummings engine SN 46773230 ISC CM2150 8.3L 360HP
I have a exhaust brake on-off switch. There is no multi-level brake switch
Its hard to hear the engine when driving but when I use the exhaust brake I never hear the loud noise tractor/semis make.
I can feel the exhaust brake work and I can see an indicator on the freightliner display when it works.
When driving into cities, there are signs NO ENGINE BRAKES
I perceive that my RV doesn't have a loud exhaust brake like Semis
Question - should I turn off the exhaust brake when I'm in a posted area?
I am in Moab and I believe there's an 8 mile stretch posted as no engine brake some areas with significant grades and the exhaust brake would help between red lights.
Does a 2008 freightliner XC Cummins 360 HP exhaust brake make a loud braking noise?
If not, should RV'rs with similar set ups shutoff their exhaust brake where posted?
I'm sure there are experts that can provide guidance on IRV2.
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05-06-2023, 11:17 AM
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#2
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Senior Member
Monaco Owners Club
Join Date: Oct 2009
Location: On the road
Posts: 2,083
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No noise because itis a different system than the big guys. Ignore the signs, not for you.
__________________
Happy Trails, 
06 Dynasty Countess III ISL//3060
07 Hummer H3
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05-06-2023, 08:53 PM
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#3
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 29,439
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I think there was only a very few ISC engines that had an engine brake; nearly all came with an exhaust brake.
This is an exhaust brake: 
This is an engine brake, and is not visible because it's under the valve cover: 
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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05-06-2023, 09:29 PM
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#4
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Oct 2008
Location: Merritt, BC
Posts: 3,753
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Those warning signs apply to OTR tractors with loud straight pipes and do not apply to unmodified motor homes or diesel pick up trucks with either exhaust or engine brakes.
__________________
Bob, Sherron & Kinsey (RIP 2013-2022)
2017 Tiffin Phaeton 40QBH
2014 Jeep Cherokee Limited
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05-06-2023, 09:36 PM
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#5
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Senior Member
Join Date: Nov 2015
Posts: 25,544
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When driving into cities, there are signs NO ENGINE BRAKES
You do not have an Engine Brake.......you have a Exhaust Brake
Ignore the Signage and use your Exhaust Brake
__________________
I took my Medication today. HAVE YOU?
Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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05-07-2023, 08:56 AM
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#6
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Senior Member
Join Date: Aug 2017
Location: St. Louis, MO
Posts: 739
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Sincere thanks to all
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05-15-2023, 08:03 PM
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#7
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Senior Member
Join Date: Dec 2012
Location: Swoope, VA
Posts: 350
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Most, maybe all, MHs have exhaust brakes. I don't know of any pick-up with an engine brake. Engine brakes are pretty exclusively on large trucks only.
__________________
2005 Chevy CC Dually D/A, 2009 2500 Suburban, 2004 Rinker Captiva 232 boat
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05-18-2023, 11:19 AM
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#8
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Senior Member
Join Date: Jan 2020
Posts: 226
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Quote:
Originally Posted by KD4UPL
Most, maybe all, MHs have exhaust brakes. I don't know of any pick-up with an engine brake. Engine brakes are pretty exclusively on large trucks only.
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ISM’s, and other big block Cummins, use engine brakes aka Jacobs Engine brakes or whoever owns them nowadays. NOT exhaust brakes.
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05-18-2023, 12:06 PM
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#9
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Senior Member
Tiffin Owners Club Freightliner Owners Club
Join Date: Oct 2008
Location: Merritt, BC
Posts: 3,753
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I believe many, if not all, ISL 9's equal to or greater that 400 hp have engine brakes. Tiffin puts a engine brake in their Phaetons on a PowerGlide chassis with the ISL 9-380 hp engine .
In any case whether an exhaust or engine brake in a motorhome neither one is loud enough to be an issue.
__________________
Bob, Sherron & Kinsey (RIP 2013-2022)
2017 Tiffin Phaeton 40QBH
2014 Jeep Cherokee Limited
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