Hello, I think mine move about 3" on a 2006 Marquis.
I do have the workshop manual and saw some of the detail on the pedal and stuff. There is a lot of junk in there and personally I wouldnt mess with it, there is a certain way to reset or calibrate the pedal positon. It talks about this in the workshop manual. Maybe you can find a workshop manual real cheap on ebay or the internet. If you do a little of your own maintenance then the book pays for itself. I'm not a major mechanic, but do what I can at home and save some money. The workshop manaul has already paid for itself.
art