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The annulus (where the pad comes in contact with the rotor) is quickly stripped of the e-coating and appears the same as any iron rotor. The e-coating remains in the radius around the drilled holes, and in the slots providing a nice contrast and high visibility of the drilled and slotting pattern of the rotor, as well as protecting those areas from rust.
Does the pad bedding process change at all with have e-coated rotors?
No, the bedding process is the same. Remember, proper break-in of pads and rotors is extremely important. Not doing so, can cause permanent damage to rotors and adversely affect overall brake performance. Pads and rotors interact with each other to provide efficient brake performance. The break-in or bed-in procedure is done to condition the pad/rotor interface. Depending on the pad used, more or less pad material is uniformly transferred onto the disc as a thin film. The resins and bonding agents in some pads need to be heat cycled to work properly as well. By not properly bedding-in pads, uneven pad material deposits can occur that may cause a vibration. Improper wear characteristics may also show up on either the pads, or rotors, or both.