The rotors develop ridges on the surface as they wear against the pads. If you put new pads on old rotors the uneven surface causes high pressure spots on the pads that glaze them over and reduce performance and longevity. Historically rotors were resurfaced when replacing pads which eliminated this. But most rotors nowadays are so thin from the factory that this is no longer an option.
The rotors develop ridges on the surface as they wear against the pads. If you put new pads on old rotors the uneven surface causes high pressure spots on the pads that glaze them over and reduce performance and longevity. Historically rotors were resurfaced when replacing pads which eliminated this. But most rotors nowadays are so thin from the factory that this is no longer an option.
Make sure you check the minimum thickness of your rotors before reusing. My rotors on my X5 are huge and heavy but get eaten through. They would never last a second use.
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