Quote:
Originally Posted by vstech
... nah. I've put rotors on that are totally rust caked, and with properly operating caliper, the rust is polished off in about 40 miles of driving. if he changes the caliper, the rotor will look shiny and new in a few days of normal driving.
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No, it won't clean up when driving.
If you look closely, the rust is burnished and the inner band is shiny showing the OUTER caliper piston is working. Now, it is unknown if the INNER caliper piston is working.
The rotor rust is very deep and won't just wipe off. Using your logic it should clean up to a bright shiny surface with a couple of rubs with 80 grit sand paper. Want to have the car owner try it and post the results?
Just for the record, I'm not a DIY / Backyard mechanic. . . .