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      04-21-2012, 06:29 PM   #10
Lieutenant Colonel

Drives: bac mono
Join Date: Apr 2010
Location: racetrack

iTrader: (3)

Yep - sounds like pad deposits from less aggressive pads. Here's a cool trick - if you put on race pads (i.e. pfc01's) and drive it around town or back from the track - it will actually scrub off your rotor clean of deposits. Modern design of rotors these days nearly eliminate rotor warp. You'll cause other damage long before the rotor starts warping unless they're really really worn thin. When I had my OE's I thought my rotors warping but it turns out it was just street pad material getting deposited on the rotor.