this switch the second one in

 

Are you talking about the switch on the bottom next to your drivers side seat heater? If so, that is your jake brake switch, activates your jacobs exhaust.

 

got ya, thanks.... new 07 thing...

 

Actually, it is just the engine brake. Jacobs had nothing to do with it! Jacobs is a whole different set up for engine braking, but anyhow, exhaust brake.

 

Dude, so your saying you have a jake brake and didn't know it?? That's funny in a way.. Not picking on you but that there's funny!!!

 

no, not my truck. i have an 07 5.9. Had not seen the inside of a new truck yet.

 

actually, you had an exhaust brake and didn't know it.

 

"Actually, it is just the engine brake. Jacobs had nothing to do with it! Jacobs is a whole different set up for engine braking, but anyhow, exhaust brake."

Actually, Jacobs has a lot to do with it, they build the exhaust brake that was an option in '06 and standard on '07 6.7 trucks. No, it's not an "engine brake" like the Jake used on big rigs but "Jake" is a trademarked name and is used by Dodge and Jacobs to describe the brake. I love mine.

Dan

 

The Jake Brake or Jacob Brake is a particular brand of engine brake manufactured and sold by Jacobs Vehicle Systems, Inc. While the term Jake Brake technically only describes Jake Brake brand engine brakes, it has become a genericized trademark and is often used to refer to engine brakes or compression release engine brakes in general, especially on large vehicles or heavy equipment

An engine brake is a braking system used primarily on semi-trucks or other large vehicles that modifies engine valve operation to use engine compression to slow the vehicle. They are also known as compression release engine brakes.


As for the term "Jake" used to describe the exhaust brake on the cummins in the dodge trucks, it is being used as a generic term. Jacobs did not engineer the turbo or the exhaust brake feature used on this truck ( which is a function of the turbo ). Jacobs engine brake uses the valve train and compression release to slow the engine. Whole different ball game. Kind of like Xerox copy. Tons of copy machines, but since Xerox was the first, that term is used a lot to describe copies.

 

vzdude, you are correct in saying that these are not "engine braking systems" but are mistaken to say that the Jake Brake offered on these trucks is being used in a generic manner. Jacobs Vehicle Systems Inc. manufactures the "exhaust brake" for these trucks. Take a look at the web site below that I pulled directly off of Jacobs Vehicle Systems Inc. website.

http://www.jakebrake.com/products/ld-exhaust.php

 

That is an aftermaket exhasut brake. Original equipment does not have that add on piece. Hoslet designed the turbo on the Dodge Rams and the exhaust brake is built into the turbo. There is no additional parts. Here is an excerpt from the service manual.

The electronically controlled Variable Geometry (VG) turbocharger is a water cooled, exhaust-driven, oil lubricated compressor that increases the pressure and density of the air entering the engine. With the increase of air entering the engine, more fuel can be injected into the cylinders, which creates more power during combustion.

The VG turbocharger allows the engine to operate in a wide power and speed range to achieve the best power, torque, and engine operating conditions.

The VG turbocharger can also provide engine braking and to reduce engine warm up time.

The VG turbocharger assembly consists of:

Turbocharger assembly
Variable Geometry Nozzle (7)
Water Cooled Bearing housing
Electronically Controlled Actuator

 

Correct, this is an aftermarket exhaust brake, designed by Jacobs Vehicle Systems Inc. to be used on the 5.9L and 6.7L CTD engines.

 

hey, that looks like my pacbrake
http://www.jakebrake.com/products/ld-exhaust.php

 

Right, however the original equipment exhaust brakes are like the excerpt from the service manual said, built into the function of the turbo. I think we are in agreement on this now right?

 

When I ordered my truck from the Dodge dealer the "Jake Brake" was an option. It is an exhaust brake that is mounted to the output of the turbo.
It is manufactured for the Cummins by Jacobson and sold as a Jake brake.
My truck also has badges on the sides just under the 3500 badges that say "Jake Brake".
I understand that it is not a true Jake brake as used on the big rigs, but this is how it is marketed by Dodge, Cummins and Jacobson.