There can be multiple reasons for having uneven tear on brake pads like: Reduction in the movement of the piston of the brake caliper or the sticky caliper Overflow of the brake fluid from the reservoir Degradation of the friction material used in the brake pads By taking care of all the mentioned reasons, you can take care of the brake pads & the braking system. In case of uneven tear on brake pads, you must try to replace them as soon as possible to avoid any damage.