Quote:
Originally Posted by Avalnch
I recently ran my HP+ pads down to around 30% at the track. I noticed that my DBA rotors had heavy black spots that were spread evenly over the rotor surface (intermittent black spots with shiny rotor metal in between).
I swapped in my Hawk Performance Ceramics and immediately, I got a severe vibration upon heavy brake pedal pressure. Coming lightly/normally to a stop did not incur any vibrations, but coming down from high speed with firm pedal pressure would make the car shake as you mentioned. I was pretty sure that it was the black spots that the HP+ pads left on my rotor. After driving an autocross event with the PC pads and about a week of driving, the black spots faded out and the vibration is now gone.
Check your rotors to see if you have heavy black streaks/patches on them, it could be the same thing I experienced.
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Will do, this sounds as I described. We just did do a lathe on the rotors do you think that would resolve it if it was the residue from the pads?