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The vgt is short for variable geometry turbo and has nothing to do with the engine brake, as the engine brake uses solenoids on the first three cylinders to hold the valves closed and building compression in the cylinders that is why they are called a compression brake or engine retarder, Cummins engine should have a button to toggle engine brake on or off and in the engine controller are settings that can be changed for engine brake only comes on when brake pedal applied or when you left off the throttle, and can toggle brake lights on with engine brake.
Also all freightliner dealers are also authorized Cummins dealers but they don’t like working on motor homes and blew you off.
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