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Old 03-08-2016, 07:51 AM   #1
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Jake Brake.

I have noticed a few posts where owners have mentioned "Jake Brakes" on particular engines and others jump in to correct them.

They go on to explain that they have " Exhaust Brakes " and not "Jake Brakes".

I did a 5 minute search and discovered that Jacobs makes exhaust brakes along with the internal, compression brakes.

I believe the owners are calling it a "Jake Brake" because that's what the little switch on the dash says.

Where am I going wrong ?
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Old 03-08-2016, 08:08 AM   #2
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You are correct. Jacobs makes both kinds of brakes, but when most people use the term "Jake Brake" they are thinking of the loud compression brakes often heard in use on dump trucks and similar vehicles. But many RVers do not understand that those engine brakes are usually not fitted to the smaller diesel engines found in most MHs and pickup trucks. Almost all of those use exhaust brakes sold under a variety of names (Pac Brake, etc). MHs being sold today MAY have compression brakes if they have the Cummins ISL engine or larger, but those MHs make up a relatively small segment of the market.
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Old 03-08-2016, 08:09 AM   #3
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I think of lot of people use "Jake Brake" as a generic term for any engine dampening device. Just as folks refer to any cola as Coke or any tissue as Kleenex.
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Old 03-08-2016, 08:49 AM   #4
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Quote:
Originally Posted by docj View Post
You are correct. Jacobs makes both kinds of brakes, but when most people use the term "Jake Brake" they are thinking of the loud compression brakes often heard in use on dump trucks and similar vehicles. But many RVers do not understand that those engine brakes are usually not fitted to the smaller diesel engines found in most MHs and pickup trucks. Almost all of those use exhaust brakes sold under a variety of names (Pac Brake, etc). MHs being sold today MAY have compression brakes if they have the Cummins ISL engine or larger, but those MHs make up a relatively small segment of the market.

Good explanation!
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Old 03-08-2016, 09:59 AM   #5
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I disagree that " Most " people are thinking of a compression brake when they hear "Jake Brake".

People in the trucking industry, yes but most RVers look at the switch plate and if they see "Jacobs Brake" thats what it is.

If I see a can of Pepsi, I don't call it Coke but it's all cola.
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Old 03-08-2016, 11:57 AM   #6
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Many RVers don't know the difference between compression brakes and exhaust brakes to begin with.
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Old 03-08-2016, 04:28 PM   #7
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Correct term is Auxiliary Brakes since engine compression brake and exhaust brake are just two possible types.
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Old 03-08-2016, 04:36 PM   #8
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OK Twinboat, why did you open this can of worms? ;-)
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Old 03-08-2016, 04:42 PM   #9
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Jacobs can call their products (engine and exhaust)...'Jake Brake' as they own that


If it holds exhaust valves open...engine braking
If it restricts exhaust......exhaust braking
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Old 03-08-2016, 05:06 PM   #10
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OK Twinboat, why did you open this can of worms? ;-)
Yep!
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Old 03-08-2016, 05:16 PM   #11
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Quote:
Originally Posted by twinboat View Post
I believe the owners are calling it a "Jake Brake" because that's what the little switch on the dash says.
I am not aware of an OEM RV or light duty truck applications that use the Jacobs exhaust brake, with a fitted OEM switch labeled "Jake Brake". Is there one?

The earlier LDT diesels only had the "engine brake", that downshifted and cut fuel, in addition to some action on the Variable Vane Turbo (which I do not fully understand). My old F350 6.4L was that....

Brian

EDIT: found it - Dodge/Cummins developed a Jake brake (exhaust) to retrofit earlier dodges with the Cummins. The models are (link from a Ram forum)
Dodge: 1998.5–2002; 2004.5-2006
Cummins: 1989-2006
OEM Engine Application Brake Model Product Name
Dodge-Cummins
B5.9 Dodge Ram TMVO 1989-1998 Jacobs Exhaust BrakeŽ
ISB Dodge Ram TMVO ‘98.5-’02 Jacobs Exhaust BrakeŽ
ISB Dodge Ram TMVO ‘03-’04 Jacobs Exhaust BrakeŽ
ISB Dodge Ram TMVO ‘04.5-’06 Jacobs Exhaust BrakeŽ



Here is a pdf flyer sheet.

i wonder if the Cummins exhausts brakes sold on todays engines are made by Jacobs?
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Old 03-08-2016, 05:28 PM   #12
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And just to add one more layer to the convo: The term "Jake Brake" is a registered trademark of the Jacobs Company, and refers exclusively to the engine compression brake systems manufactured by the Jacobs Company. It does not apply to any other system, including the exhaust brake systems manufactured by the same company.
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Old 03-08-2016, 05:53 PM   #13
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The term "Jake Brake" is a registered trademark of the Jacobs Company, and refers exclusively to the engine compression brake systems manufactured by the Jacobs Company. It does not apply to any other system, including the exhaust brake systems manufactured by the same company.
I believe it does include their exhaust brake - from the Jacobs company website in the frequently asked questions:

"Jake BrakeŽ is a registered trademark of Jacobs Vehicle Systems™. The term "Jake Brake" is sometimes incorrectly used to refer to compression release type engine brakes in general. The term correctly refers to all of Jacobs Vehicle Systems retarding products including Jacobs Exhaust Brakes and Jacobs Driveline Brakes as well as Jacobs Engine Brakes."

Brian
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Old 03-08-2016, 06:30 PM   #14
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Originally Posted by Old-Biscuit View Post
Jacobs can call their products (engine and exhaust)...'Jake Brake' as they own that


If it holds exhaust valves open...engine braking
If it restricts exhaust......exhaust braking
I hope you are simplifiying the operation, in your explanation.

A compression brake does not just hold the exhaust valves open.
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