The only spring is the one inside the master cylinder. That should be enough to push the pedal back. The light switch should be adjustable. Unless it's been modified, on a '69 it should be adjustable where the switch bolts to the bracket above the steering column. You slide it back/forth until the brake lights work properly. The screw holding the switch to the bracket is a PITA to get to. (Hopefully you are not too old like me and can get up under that dash without hurting yourself!)
