If you do adjust your brake line length it is VERY IMPORTANT that you do not shorten them to much. You must have some slack in the line when you put your hands all the way up. The brake line should look like this ). If there is no slack in the brake lines, the wing may stall much easier and might not recover from a stall. If there is no slack and you fly a reflex wing at full speed, you may get very large collapses that occur because the brake lines are deflecting the trailing edge.