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Message: <blockquote data-quote="Nasty02Avalanche" data-source="post: 3465" data-attributes="member: 414">That is one of the reasons why the older disc brake kits came with new bolts and new hardware - stainless steel shims.You also have to replace the rubber boots.Sometimes the caliper is so bad - you have to get a new one.I'm not aware of a exact sized drill bit to drill out the bore for the pins.I had a pin once that snapped when I tried to turn it.I put it in a mill and tried to machine it out.The caliper wouldn't sit square in the vise and I ended up drilling the hole at an angle.The dual calipers were the most famous for this.This is the reason why GM recommends that you replace the calipers and the rotors when you do a brake job.</blockquote>