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Old 10-11-2014, 01:47 PM   #1
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Exhaust brake

Exhaust brake
I have a 2005 Alpine coach 38ft with a 8.9 Cummins. What exhaust brake will this unit have? When I apply exhaust brake I feel it slow when coming to a stop. I then switch off and on accel eng has no power and blows black smoke on heavy accel. I made a stop for fuel for about 10 min and when I restarted started to drive, on accel if was working great until I use exhaust brake again. Same on accel no power black smoke. Any ideas on this
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Old 10-11-2014, 02:01 PM   #2
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Glad you're aboard. My guess is it's an exhaust brake that is in the exhaust right after the turbocharger. IMO Sounds like it needs lubrication with special lube for that type of brake. Best of luck on freeing it up. If you can't then a replacement may be needed. Enjoy your adventures and be safe.
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Old 10-11-2014, 02:01 PM   #3
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When was the last time you lubricated the exhaust brake with Pac Brake Exhaust Brake Lube?
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Old 10-15-2014, 09:28 PM   #4
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I have a 8.3 which is a exhaust brake. If you have a 8.9? You can have a compression or exhaust brake.
I believe a compression brake will have a Hi and low off and on switch for the brake.
If it’s only a off or on then it should be a exhaust brake.
If you lift up the very heavy motor cover ( bed) you will see the air solenoid on the exaust pipe.
This will be the exhaust brake. It’s on top and very easy to see.
Try lubing it with very high temp grease or whatever the owner’s manual says.
If it’s a compression break? I would seek professional advice.
Good luck.
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Old 10-15-2014, 09:56 PM   #5
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Pacbrake sells a lube specifically for the very high temperature of exhaust brake parts.
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Old 10-16-2014, 11:19 AM   #6
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I have a VGT turbo and it is at Freightliner right now getting diag. will keep you updated.
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Old 10-16-2014, 05:52 PM   #7
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Interesting input on PAC-Brakes but none of it applies--2005 with the ISL 400 came with true "Jake" Brake. Its a Cummins engine --so not sure why you are at Freightliner--keep us post on what they tell you about Cummins.....
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Old 10-16-2014, 07:01 PM   #8
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Cummins vs. Freightliner

OS ... My personal preference for Cummins engine & Allison transmission repair would be Cummins and the store in Denver was excellent. I'm now in Arizona where the local Cummins shop has been identified in multiple posts as causing issues for Alpine owners. Therefore, I elected to take my coach to Freightliner and am very pleased thus far. I believe the costs for basic services has been slightly less than what I experienced in Denver.
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Old 10-16-2014, 07:11 PM   #9
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Agree-- the Cummins folks in Phoenix [Goodyear????] are not trustworthy....however, without prior knowledge of a maintenance facility, I would still be incline to take my Cummins engine problem to a Cummins shop.....
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Old 10-20-2014, 08:41 AM   #10
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Exhaust Brake

Well got my RV back from Freightliner last week and what they check and found was a bad intake manifold pressure sensor. They replaced sensor and all is good. Jake brake is working no black smoke and have full power again. The reason why I took it to Freightliner of Corpus Christi was that the Cummins dealer does not work on RV's. I was very happy with Freightliner they got me in, diag concern, and order part that was needed. Was in and out in 2 days.
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