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Old 06-15-2017, 03:44 PM   #1
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Exhaust Brake Enabling

I have a 2008 newmar ventana with cummins isb 6.7 and Allison auto. have found wiring for exhaust brake in right console, Can I just install a exhaust brake switch and it will work? It did not come speced for it. but has vgt and labeled wiring in console. any help on this would be greatly appreciated.
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Old 06-15-2017, 03:50 PM   #2
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I have a 2008 newmar ventana with cummins isb 6.7 and Allison auto. have found wiring for exhaust brake in right console, Can I just install a exhaust brake switch and it will work? It did not come speced for it. but has vgt and labeled wiring in console. any help on this would be greatly appreciated.
There's more to it than adding a switch. Do you have the exhaust brake, actuator, solenoid control etc? Do you have a Freightliner or Spartan chassis? The brake would have been supplied by the Chassis provider. A call to them with your VIN should yield an answer to your question.
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Old 06-15-2017, 03:50 PM   #3
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If the physical exhaust brake is not installed then just adding a switch will not do anything. Chassis are wired for multiple options to be installed.
I have a single stage engine brake but also have wiring for exhaust brake and high low switch. But no exhaust brake on the engine or wiring harness for high low switch.
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Old 06-15-2017, 03:53 PM   #4
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If the physical exhaust brake is not installed then just adding a switch will not do anything. Chassis are wired for multiple options to be installed.
I have a single stage engine brake but also have wiring for exhaust brake and high low switch. But no exhaust brake on the engine or wiring harness for high low switch.
If you have an engine brake you won't need an exhaust brake.
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Old 06-15-2017, 03:56 PM   #5
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If you have an engine brake you won't need an exhaust brake.


Yes. Just providing information for the OP.
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Old 06-15-2017, 04:10 PM   #6
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Thank you for the feedback. The slip ring inside the variable geometry turbo provides the engine braking.
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Old 06-15-2017, 04:14 PM   #7
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Thank you for the feed back. The turbo is the exhaust brake on an isb cummins. the slip ring inside the turbo provides the braking effect.
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Old 06-15-2017, 04:22 PM   #8
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engine brake wiring

Thank you for the feed back. A little more detail, I have the variable geometry turbo on the engine, the slip ring inside the turbo restricts exhaust flow providing the braking effect. The turbo is controlled by the ecm from sensor inputs to insure optimum engine performance and emmissions. So upon finding the wiring under the console I began to wonder if possible to put a switch in it. Was wondering if anyone has ran into this before. I bought the coach used.
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Old 06-15-2017, 04:44 PM   #9
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I would call cummins with your engine serial number. They should be able to answer that question.
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Old 06-15-2017, 04:55 PM   #10
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Thank you for the feedback. The slip ring inside the variable geometry turbo provides the engine braking.
On my ISX I have both a three stage true engine brake and the VGT acting as brakes. VERY effective but it takes a little longer than I like to engage.
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