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Old 10-01-2014, 07:11 PM   #1
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Jake Brake vs. Pac Brake: Which Cummins HP?

Which Monaco Windsors or Dynasty models came with the Jake Brake vs. Pac Brake? In other words did certain Cummins engines come with the Jake Brake and others came with the Pac Brake? Did the 350 HP come with the Pac Brake but the 400HP came with the Jake Brake?

The reason I ask is I think the Jake Brake is superior to the Pac Brake because the Jake is based upon internal valve train activation while the Pac Brake is simply an obstruction in the exhaust pipe, and I want to try and find a model, year and engine HP that came with the Jake as I continue to shop for my dream cruiser.
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Old 10-01-2014, 07:17 PM   #2
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Jacobsen makes both compression and exhaust brakes. So you can call both of then Jake brakes and still be right.
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Old 10-01-2014, 07:30 PM   #3
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Comes down to engine model; not HP rating; as there are some overlaps.

ISBs the 5.9 later the 6.7 had either the Pac ( exhaust brake) or after 03 a VGT ( Variable Geometry Turbo) . From what I've read, ISCs ( 8.1-8.3 ) were available with engine brake , but most often equipped with exhaust brake in MH applications. ISL ( 8.9-9.0) engine brake , to the best of my knowledge.
If the engine( exhaust) brake control switch , has a stage 1 and stage 2 setting , is the only tell in many RV's. Single position most likely exhaust brake, 2 positions engine.
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Old 10-02-2014, 06:17 AM   #4
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Jake Brake vs. Pac Brake: Which Cummins HP?

Quote:
Originally Posted by TimSullivan View Post
Which Monaco Windsors or Dynasty models came with the Jake Brake vs. Pac Brake? In other words did certain Cummins engines come with the Jake Brake and others came with the Pac Brake? Did the 350 HP come with the Pac Brake but the 400HP came with the Jake Brake?



The reason I ask is I think the Jake Brake is superior to the Pac Brake because the Jake is based upon internal valve train activation while the Pac Brake is simply an obstruction in the exhaust pipe, and I want to try and find a model, year and engine HP that came with the Jake as I continue to shop for my dream cruiser.

Tim,

It depends on how far back you go. After the ISL became the standard engine, both coaches had engine compression brakes. The ISC, which was used earlier, could be equipped with an engine brake but Monaco never used it. The ISC was exhaust brake equipped. Later, after the VGT exhaust brake was introduced, Monaco equipped some ISL powered coaches with the VGT type brake to separate coach lines. This was not done in either the Windsor or the Dynasty.

Good luck with your search. I don't own one, but in my opinion, the Dynasty, in almost any year, in a lot of coach for the money. Getting a coach built on that S Series chassis is a major deal.


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Old 10-02-2014, 08:47 PM   #5
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We have an exhaust brake. Got a real kick out of my brother the trucker. When he drove it his comment was. " that brake means business, it obviously understands that stop means STOP AS IN RIGHT NOW!!!!!
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Old 10-03-2014, 06:28 AM   #6
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Quote:
Originally Posted by Mr_D View Post
Jacobsen makes both compression and exhaust brakes. So you can call both of then Jake brakes and still be right.
And PAC also makes both engine compression brakes and exhaust brakes. So neither term is unique.

Although generally, when someone says PAC brake they mean exhaust brake, and when they say Jake brake they mean engine compression brake, since that is what each company is predominately known for making.
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Old 10-03-2014, 12:09 PM   #7
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30 years in trucks with Jakes, this is the first PAC brake I've had. There is a difference between the two. I would prefer a Jake but I am impressed be how the PAC works. I had to adjust to it but if you haven't used a Jake you won't know the difference. If you have used a Jake you will adjust easily to it. There are things you can do with a Jake and Cruise control that you can't do with a PAC, but as I stated if you don't know....
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