That's on the 650. The 400 has no adjustment I'm aware of.Though it won't actually adjust the brakes, you can adjust the travel of the brake lever with that little numbered chrome disc on top of the lever. If you push the lever forward (rather than pulling it back as you do when you hit the brake) you can easily turn that disc and get more or less lever travel.
Do you have the 650 or 400?I am lost, do not see any numbered chrome disc. Mine is 2007