Could be just that the rotors are glazed. You can put a sanding disc (the 3M Scotchbrite work best, but a sanding disc around 120 grit will work) on a 90 degree and hit the rotors. Some backing plates make it impossible to do the back of the rotor without taking of the caliper but it can be done on the spindle.
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'68 Short Step
LS1/T56, Hydratech, Fatman Fabrications Stage III, Baer, Hot Rods to Hell, US Body, S&W, etc
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