One technique to resurface rotors is to use new pads, as in 2 or 3 sets in a row to wear down the high ridges.
This is of course if you are really in need of using up spare time.
• The hidden harmony is found with joy, while the obvious brings indifference.
• The farther you enter into the Truth the deeper your conviction for truth must be.
• There is understanding of the world precisely to the degree that there is understanding of the Self.
Collected Works of the WingMakers Volume 1 pg. 590