It depends on what type of coating is on the rotors. The rotors we used to get had some sort of light oil coating that needed to be washed off. But, some rotors these days have a rust preventing zinc coating. The ones I last installed said to leave it on.
Brembo says:
Quote:
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As a world leader in the design and production of braking systems for the most important carmakers, Brembo has developed extraordinary expertise in the production of coated discs for all leading vehicle manufacturers. The portfolio comprises all possible variants - from Geomet, zinc and epoxy coating through to the most modern and advanced: UV coating.
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Huskyman, you should find out and advise just what type of coating you have.
If it is zinc,
this link has some good info. If plain steel with oily surface coating, Frank's advice is good.
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Graham
85 300D
,72 350SL, 98 E320, Outback 2.5