You would be surprised how many garages still use copper grease for all parts of the braking system. It should be silicone grease as stated earlier or a good high temperature grease will be ok for all the sliding parts. Copper grease will "swell" the rubber components. Copper grease is really an assembly compound. The lubricant dries out and leaves a small copper film. OK for threads etc but not good for a sliding application.
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