S3 Brake caliper making noise
 

My GSL-SE front brakes make popping sounds. The calipers seem loose on the guide pins. Car has 146,000 miles and good pads/discs. If I get new guide/slide pins will that be enough? If the bore that the pins ride in is worn? Does anyone resize this? Say with a bushing. I would expect that any used rebuilt caliper would still be worn in this area.