MerlintheMad
10000 Posts Club!
"What does happen is that the layer of pad material on the rotor surface builds up unevenly, and also, the metallurgy of the rotor can change states. The layer of pad material on the rotors surface, if unevenly distributed, will create hot spots. If these spots get hot enough, it can form cementite in the rotors metal – a rough iron carbide formation that creates a lot of friction, but is terrible at dissipating heat. The cementite formation can get so bad and cause so much friction that even when you are off the brake pedal completely, because your pads are always in contact with the rotor ever so slightly, it can create a vibration when driving normally. I have even mistaken this vibration as my tires being out of balance."Here's a link that goes through where I'm coming from:
Rotors: Blank vs Cross Drilled vs Slotted and Warping | Automotive Thinker - Discussing the finer points of automobiles
This is the single most informative paragraph that I have read on the subject. Thanks for the link.
