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Exhaust brake quit working

captron33
Explorer
Explorer
Lets try this again! Need some help. Cummins 400 isl, spartan chasis 2006 travel supreme.
I guess next will be taking it to a tech!
18 REPLIES 18

wolfe10
Explorer
Explorer
With a two stage engine compression brake, you WILL have an electric signal that both downshifts the Allison (left or only shift pad window will change from 6 to some lower gear-- often 2nd or 4th) AND will signal the engine ECU to apply either 3 (low) or 6 (high) compression braking.
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

captron33
Explorer
Explorer
Its labeled exhaust brake on the switch. Hi and low. Obviously I’m not a mechanic, i will take to one to get it looked at and fixed. Its in storage for 6 months or so for now. Spartan told me the only electrical component is a diode. So no cb,s to check out.

wolfe10
Explorer
Explorer
captron33 wrote:
No, probably not electric.


Please explain what this means.

Thanks.
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

wolfe10
Explorer
Explorer
captron33 wrote:
Spartan confirmed i have a 2 stage exhaust brake., based on my vin number.


No such thing.

If two stage, it is an ENGINE COMPRESSION BRAKE.
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

Ray_IN
Explorer
Explorer
captron33 wrote:
Spartan confirmed i have a 2 stage exhaust brake., based on my vin number.


Then your engine has a 2-stage engine compression(Jake) brake, not an exhaust brake. The Jacobs compression brake opens the exhaust valves just before the piston reaches TDC on compression stroke.
reference: https://official.bankspower.com/tech_article/how-an-exhaust-brake-works/

and
https://www.jacobsvehiclesystems.com/technologies/compression-release-engine-brake
2000 Winnebago Ultimate Freedom pushed by a 2013 Chevy Silverado K1500 And so, my fellow Americans: ask not what your country can do for you — ask what you can do for your country.John F. Kennedy 20Jan1961

oldave
Explorer
Explorer
2-stage exhaust brake? Are you sure? Not an engine brake? I believe a 2-stage is an engine brake.
An engine brake is much more effective.

larry_cad
Explorer
Explorer
captron33 wrote:
No, probably not electric.


Then I would look into the butterfly valve mechanical operation. The valve is easy to remove and then it is easy to verify if the valve is working.
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captron33
Explorer
Explorer
No, probably not electric.

larry_cad
Explorer
Explorer
captron33 wrote:
Spartan confirmed i have a 2 stage exhaust brake., based on my vin number.


Did they offer any suggestions on the problem?
Today is my personal best for most consecutive days alive.

Our Travel Blog

captron33
Explorer
Explorer
Spartan confirmed i have a 2 stage exhaust brake., based on my vin number.

Ray_IN
Explorer
Explorer
Blaster Man wrote:
I had an 09 Allegiance with an ISL 400...it had a two stage engine brake...not an exhaust brake.


It would sure help if captron33 also told about his MH and type exhaust brake.
2000 Winnebago Ultimate Freedom pushed by a 2013 Chevy Silverado K1500 And so, my fellow Americans: ask not what your country can do for you — ask what you can do for your country.John F. Kennedy 20Jan1961

larry_cad
Explorer
Explorer
Blaster Man wrote:
I had an 09 Allegiance with an ISL 400...it had a two stage engine brake...not an exhaust brake.



Uhhhhh........gee Thanks!
Today is my personal best for most consecutive days alive.

Our Travel Blog

Blaster_Man
Explorer
Explorer
I had an 09 Allegiance with an ISL 400...it had a two stage engine brake...not an exhaust brake.
2014 American Eagle

wolfe10
Explorer
Explorer
As you can see, we need more information to be of assistance.
Brett Wolfe
Ex: 2003 Alpine 38'FDDS
Ex: 1997 Safari 35'
Ex: 1993 Foretravel U240

Diesel RV Club:http://www.dieselrvclub.org/

keefr
Explorer
Explorer
If it's a PAC brake, a likely cause is lack of lubrication on the pivot. It's not difficult to remove the unit, and if it can be freed, great. I had to have the exhaust brake replaced on my motorhome shortly after I got it, and it wasn't hugely expensive. I subsequently replaced it again with an upgraded brake that is designed to be effective at lower engine rpm. Again, not a huge expense.
Never argue with an idiot - they drag you down to their level and beat you with experience. - George Carlin