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Old 08-31-2021, 03:18 PM   #1
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'Jake brake' question

i am unsure about the exhaust brake rocker switch on the transmission panel. which direction is full on and the other half on? I've experimented and can't tell much difference.
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Old 08-31-2021, 03:21 PM   #2
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i am unsure about the exhaust brake rocker switch on the transmission panel. which direction is full on and the other half on? I've experimented and can't tell much difference.

IF it is an exhaust brake, it will either be ON or OFF.


What engine do you have?



Indeed, engine compression brakes can have ON low/ON high/OFF.
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Old 08-31-2021, 03:31 PM   #3
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400 hp Cummins ISL
I read in the tech info somewhere that the jake can use half the cylinders or all of them.
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Old 08-31-2021, 03:36 PM   #4
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400 hp Cummins ISP
I read in the tech info somewhere that the jake can use half the cylinders or all of them.

The Cummins ISL could be speced with EITHER an exhaust brake (less $$) or 2 speed engine compression brake (more $$, so on higher end coaches with that engine).


Find the turbo. If you have an exhaust brake, it will likely be bolted to the turbo.


An engine compression brake (Jake brake) is internal to the head-- nothing externally visible.


OR, you could call Cummins with your engine serial number.



Cummins 800-286-6467
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Old 08-31-2021, 03:41 PM   #5
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Also not all engine brakes are fully wired for the Hi-Lo switch.
Our 2002 ISL400 with engine brake is only On or Off. It has a dummy plug in the harness which is High only(all 6 cylinders).
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Old 08-31-2021, 03:53 PM   #6
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In a Country Coach of that year, you could have either an ISC or an ISL
The ISC has an exhaust brake and is either on or off. The switch will be a two position switch.

The ISL has a true Jake and the switch will be a three position, off, high and low.


There is no ISP motor and CC did not use an ISB in that coach
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Old 08-31-2021, 04:14 PM   #7
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ah, that would explain why both positions feel the same.
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Old 08-31-2021, 04:16 PM   #8
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ah, that would explain why both positions feel the same.

I would still confirm this with Cummins. Would hate for something simple to keep you from having a two stage engine compression brake.
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Old 08-31-2021, 04:17 PM   #9
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ah, that would explain why both positions feel the same.

If it feels the same is the Exhaust/Engine brake working at all?
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Old 08-31-2021, 04:43 PM   #10
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If it feels the same is the Exhaust/Engine brake working at all?
it definitely works. off is definitely off but can't tell much difference between the other 2 options.
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Old 08-31-2021, 04:44 PM   #11
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Ok, thanks for the clarification. So it’s a 3 position switch?
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Old 09-01-2021, 07:04 PM   #12
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On my ISL the jake is off when the rocker switch is in the middle position, high is depressed forward and low is depressed toward the rear. High and low are very noticeably different in effect.
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Old 09-01-2021, 11:52 PM   #13
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My 400 ISL has a Jacobs Engine Brake. It is two - three cylinder devices internal on the engine, each operated by an electric solenoid. If it is working right, low (one Jake) will give you the Cummins death rattle just before it disengages as you come to a stop. High (both Jakes) does not produce the death rattle before it disengages. High has a more aggressive braking action especially at highway speed. At low speed it is not as noticeable of a difference.

One way to test your switch and high/low action to understand the brake feel, is to pull the wire off the front of engine (at rear of coach) Jake solenoid. That is the low Jake. With that wire off and the rocker switch in the high (both Jakes) position, you should have the Cummins death rattle as only one Jake (rear of engine high Jake) will be operating. With the switch in the low position you should have no Jake as it is disconnected.

The attached pic shows the rear Jake and wire to solenoid looking down from the top with the valve cover off. The arrow is the front Jake wire going to the rear of the coach. It can be reached through the rear cap engine access and is a simple push on 90 deg wire connector.

When your done testing push the wire back on the front of engine Jake.

I only had high regardless of what position the switch was in. I could not find the root of the problem so did a work around. Now I have high/low function.
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Old 09-02-2021, 11:34 AM   #14
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If it is working right, low (one Jake) will give you the Cummins death rattle just before it disengages as you come to a stop. High (both Jakes) does not produce the death rattle before it disengages. High has a more aggressive braking action especially at highway speed. At low speed it is not as noticeable of a difference.
Great description. I've never heard the noise you get with low called the Cummins death rattle, but it's appropriate. The first time I heard it I though something was seriously wrong with my coach's braking system!
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