It will even both sides out. It affects the adjustment of the shoes so will affect the brake pedal. Can't remember for sure but I think that you will also feel the brakes apply a little higher on the pedal after a notch gets taken up. It's one reason that seems rational for converting to disc brakes if you're in to precise brake performance. Should emphasize though that you need to be sure the parts are clean, lubricated, and not worn, in order for the system to work correctly. You can test it with a drum off by pulling the cable by hand and watching the parts move, I think.