Thanks Jon, the problem is i dunno how to create a nice sound, lol :(
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Well basicly to create a sound, the sound file must be .ogg file (Atleast that I know of, you can try with .wav or mp3 aswell)
Then you enable Audio by doubleclicking the workspace ( Same way you did to add Keyboard )
Then you go to the projects panel, right click on "Sounds" and then "Import Sounds", then select the sound file you want and click Import.
After that you have to add an action, in the action for example when the car goes forward or brake, you add a "Audio -> "Play" <Select File> "Not Looping" And then Ok and you're done.
Hope I helped. :)