I also agree with Porky, sounds like your clutch is not disengaging. The engine brake helps slow you down, but then at low speed, it should not be engaged. However your clutch is still engaged and that is what you were fighting. It could be a sensor adjustment or something mechanical, hard to say what is going wrong.
My engine brake has to be manually turned on each time the engine is started, the default is no engine brake unless I turn it on. So at least for me it is not possible to start the engine brake with the brake on. I also have to select which of the three levels of engine brake. It does engage and do its thing automatically once turned on.
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2005 Kenworth Showhauler 45 ft total length
twin screw, 450 hp ISX, 10 speed Ultrashift
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