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Old 09-02-2014, 11:18 AM   #1
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Exhaust brake not working

Hi, I have a 2000 37' Tradewinds. We took it out over the weekend and found that the Jake brake is not working. The RV is new to me and have not gotten completely familiar with it. Until now the jake brake worked great. It didn't this weekend. I would think the 1st thing to check is the fuse ( assuming there is a fuse). I'm guessing it would be in the panel next to the drivers seat. Some of the fuses are not identified as to what they belong to making it somewhat difficult. Can anyone give me a good starting point to this problem. Hoping it is something common that others have already dealt with. Thanks in advance.

Rod
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Old 09-02-2014, 11:22 AM   #2
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Jake Brake is an engine brake.

Jacobs also made an exhaust brake as did PacBrake and others.

Most ISC 8.3 Cummins engines have an exhaust brake and some 400 ISL Cummins engines have exhaust brake also.

Which do you have? (If you create an automatic signature with your Coach info it will help others respond.)
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Old 09-02-2014, 11:29 AM   #3
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Welcome to iRV2.

Some chassis manufacturers the , exhaust brake or engine brake , will not function while the cruise control is turned on.

So chassis manufacturer and engine type and size. Information on actual type of brake is needed too. Jacobs makes both types.
Is your coach equipped with a switch for the brake that says " Hi/Low or stage 1 ,2 " ?
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Old 09-02-2014, 12:08 PM   #4
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I have an exhaust brake. You are right, I will create a signature. Thanks
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Old 09-02-2014, 12:10 PM   #5
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I did not have the cruise control on. My switch is just on or off.
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Old 09-02-2014, 12:19 PM   #6
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Your exhaust brake will have an air pressure solenoid , air line( in the engine bay) and activation cylinder (on the exhaust). After you check all the fuses, check the air line from the solenoid to the cylinder for a rupture.
Many owners report them being melted by the exhaust.
Does your transmission control , indicate 2 , for gear selection , when you release the throttle , with the exhaust brake turned on?

To set up a signature line .
From " User CP" left end of the blue bar under your welcome message.
Left side of the page , click " Edit Signature" enter the info and click save at the bottom of the page.
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Old 09-03-2014, 07:44 AM   #7
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The first thing I would do is see if the butterfly on the exhaust brake will move. It is spring loaded. It's hard to miss as it's after the turbo and connected inline on the exhaust pipe. While there it's a good time to lube it and inspect the area for other problems as suggested.
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Old 09-03-2014, 07:54 AM   #8
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I have an 05 Neptune with the 5.9 ISB and was told that exhaust brakes do not need to be lubricated. Did I get the wrong info? Was concerned about this some time ago and was told by Cummins that it does not need it. Clarification/confirmation would be nice, thanks.
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Old 09-03-2014, 07:55 AM   #9
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Exhaust brakes if not used regularly need to be lubricated. Even if they are it's a good idea to lubricate them at least once per year. I like to use Tri-Flo Lubricant which has been approved by the Pacbrake Techs.

Maintenance | Pacbrake

Generally there is a relay which will activate an air solenoid and tell the Allison to downshift to an aim point which is commonly 2nd gear.

You have to troubleshoot which component is not working correctly.

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Old 09-03-2014, 01:04 PM   #10
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Ok, I was pretty sure I had been down this road before so I checked with Cummins and then Monaco. On the left of the drivers seat are switches and one says "exhaust brake". The manual gives instructions for lubing the pac brake (confusing). I double checked with Monaco today and I have neither! I have a VGT which I was informed does not require any maintenance. Any thoughts on this? In regards to the original post, maybe you have a VGT?
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Old 09-03-2014, 06:37 PM   #11
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The only thing a Combo VGT Turbo/Exhaust Brake needs to lots of use.

Great if you don't live in Florida. LOL

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Old 09-03-2014, 07:37 PM   #12
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On my 1998 Tradewinds, there is a fuse for the exhaust brake located next to the drivers seat, but not in a fuse panel. It's an inline 10A fuse. I have had to replace it once. Follow the leads from the switch, you'll find the fuse housing connected.
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Old 09-03-2014, 07:38 PM   #13
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Exhaust Brake fuse

On my 1998 Tradewinds, there is a fuse for the exhaust brake located next to the drivers seat, but not in a fuse panel. It's an inline 10A fuse. I have had to replace it once. Follow the leads from the switch, you'll find the fuse housing connected.
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Old 09-04-2014, 09:53 AM   #14
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Great! Thanks for all the help, it is much appreciated. Hopefully I can track this problem down. it really sucks not having that compression brake.
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