Exhaust brake quit working

captron33 wrote:
Lets try this again! Need some help. Cummins 400 isl, spartan chasis 2006 travel supreme.
I guess next will be taking it to a tech!

First, Brett and Larry know much more about exhaust brakes than I do. That said, when my 2005 400ISL exhaust brake failed after about ten years, on the theory that brakes are important, I replaced it with an upgraded model.