  Older calipers can have their arms bent slightly to toe-in brake pads. Using a couple of 0" adjustable wrenches tightened onto their slotted flats (that the pads are mounted to), push the handles in or out to adjust. If this makes you nervous, you can always take some sandpaper to the contact surface of the pad to reshape it.  Older calipers can have their arms bent slightly to toe-in brake pads. Using a couple of 0" adjustable wrenches tightened onto their slotted flats (that the pads are mounted to), push the handles in or out to adjust. If this makes you nervous, you can always take some sandpaper to the contact surface of the pad to reshape it.  