To operate the exhaust brake on a 2024 Winnebago Journey, press the engine brake button located near the touchscreen to toggle through its three modes: off (default), on, and auto. In the on mode, you'll see a yellow indicator light and experience full braking power when you release the accelerator. Press the button again to activate auto mode, indicated by a green light, which provides smoother braking and can automatically maintain speed. Press the button a third time to turn the feature off.
Some MH's have the ability to select them Allison transmission gear it changes to when the E-brake activates; it will be discussed in your owners manual, likely the engine owners manual.