PowerStop has a reputation for precision and adherence to the strictest OEM standards, which extends to our brake shoe line. The PowerStop Autospecialty brake shoes are made with a semi - metallic formula that is post cured for increased braking power and a shorter break - in time. These shoes are precision cam ground for proper fitment to the drum and chamfered to prevent noise and chatter. All shoes are 100 asbestos - free, copper - free and made from new steel that is coated to resist rust.