They lessen the squealing and reduce the amount of noise/grinding/vibration transfered from the rotor/pad to the fixed calipers... makes for smoother and quiter brakes. If you seperate them from the pads without damaging them and they still look ok you can re-use them, but for the price you can just buy some new one. I'm pretty sure these are the 28mm ones
996 352 086 02
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Previously owned:
2000 Boxster S 3.2 Ocean Blue / 1974 911 Targa Silver
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