You can reassign the keyboard keys in Options->Keyboard. By default, semicolon (;) turns retarder on, single quote (') turns retarder off. You can reassign the keyboard keys in Options->Keyboard. More specifically: semicolon increases retarder effect, single quote decreases retarder effect. To turn it off via hotkeys, it can take multiple
Check your settings for the retarder increase/decrease keys and hit the decrease key in-game for a few times. As far as I understand, this is a bug. If you press the apostrophe key, it should go away. The retarder is a part of certain transmission configurations.
If you lift your gas pedal, you "use" engine break. I dont drive a semi truck irl so i dont know if you would use the retarder and maintain your throttle/pedal position while going downhill. I my car, I just down shift to a lower gear and dont use my gas pedal to maintain speed downhill. I never use my break pedal unless i have to slow down.
Each of the trucks now has a choice of transmission, one without a retarder and one with a retarder. I've tried the retarder in-game and it's not really useful. It's too strong of an effect so it's hard to control and there really aren't enough big hills that you could actually use it on. I find that the motor brake (jake brake) is more useful.
the automatic retarder option has NOTHING to do with the retarder for Cruise Control, Automatic Retarder will be used when you use your service brakes, the retarder will work in tandem with it. what you want is that cruise control will maintain the set speed and SND and Reinhard have already provided an answer to it.
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euro truck simulator 2 retarder how to use