Item #: GD_GG09_HDPUMP
  • About This Product
  • Reviews
  • Install And Tech Information


The 2003 thru 2007 Dodge/Cummins Turbo Diesel Jacobs exhaust brake is a belt driven pump with a dry sealed bearing behind the pulley and two internal roller bearings in the rear cavity supplied by its own small pre-filled oil reservoir with an internal shaft oil seal.

When the pump has reached the end of its service life it usually becomes audible and the oil from inside the pump begins to appear on the top of the pump. The oil is usually black in color.

The shaft inside the pump has a small cam pressed on to it that activates the diaphragm piston. This is built into a roller bearing that is lubricated by the oil in the pump.

The Heavy-Duty Jacobs Exhaust Brake comes with an original design steel pulley that turns at a slightly lower RMP range having no effect on the jake brake operation, but extends the life of the pump. The pump is ready to bolt on and go with the existing belt.

The heavy duty diaphragm is similar to the factory original but has a slightly larger and more robust diaphragm that has a decreased stroke which equals less work for the internal components. To help cut down on pump noise during operation the heavy duty diaphragm has a larger noise suppressor.

1-year manufacturer warranty.


Write a review
Exhaust brake pump
Sep 29, 2017  |  By David
Shipped quickly, arrived on time, was exactly as described. Works well seems to be of good quality. I would buy again and the service has been spot on.

The right stuff
Aug 21, 2017  |  By Steve
As usual the filters etc. are excellent and this time I ordered extra niceties for the interior all of which were as described. The most pleasing thing was the heavy duty vacuum pump for my exhaust brake which fit perfectly. my decision to by was from the video I watched, thanks. now only time will tell.

Jake Brake
Jul 15, 2017  |  By Michael Rossignol
New Jake Brake works fine. Easy install

Vacuum pump
Feb 14, 2017  |  By Anthony Van Leest
Ordered a vaccum pump for my 2005 Dodge 2500. Easy to install and works like a charm. Glad there is a place like Geno's Garage to order parts from.

vacuum pump
Oct 20, 2016  |  By Eugene Beverage
The pump was as described. It is working as it should.

Jake Brake Pump
Sep 27, 2015  |  By DNelson
Bought this replacement pump when the original failed, and my system works great once again. Fit was perfect and easy to replace!

Install and Tech Information

Download Jacob Exhaust Brake Installation Instructions.pdf