Which of the following is not correct in the procedure for preparing a brake rotor for matching?

The procedure for preparing a brake rotor for matching includes several critical steps, and one key aspect is using a brake micrometer to measure the diameter. Accurate measurement is essential to ensure that the rotor meets the specifications required for safe braking performance and that it is compatible with the brake pads.

In this context, using a brake micrometer is important because it provides precise measurements that help determine if the rotor is within acceptable tolerances. This aids in identifying any excessive wear or damage that could compromise braking effectiveness. Accurately measuring the diameter allows for proper matching with brake pads, ensuring even contact and maximizing the lifespan of both components.

While cleaning the rotor surface, inspecting for warping, and replacing worn rotors as necessary are all vital parts of the preparation process, these steps do not directly relate to the measurement phase as indicated in the question. Hence, the understanding that measuring with a brake micrometer is part of the correct procedure makes option A a poor representation of the necessary steps for properly preparing a brake rotor for matching.