brake wear wires are a means of warning that the thickness of the lining on the brake pads has become critical and the pads need to be checked with the view to replacement.
The brake wear wire has an electrical contact that slots into the brake pad at a level close to the end of the pads usable contact surface. When the pad wears away and reaches the designated point a circuit is achieved with the contact on the brake disc and a warning light is illuminated on the dashboard panel warning the driver that the pads are worn down and need replacement.
When the pads are replaced the wear wires need to be checked for damage and renewed if necessary. If the pads are not changed and the pads wear below the warning wire level the contact on the wear wire will be damaged and will need replacement. brake wear wires is the perfect replacement part, specifically made to fit the make and model of your vehicle.