The floating caliper bolts generally can be cleaned up and relubed.

With a clean and lube each time, they should last the life of the car.

Make sure the rubber boots are not torn.

I use silicone grease (thick grease, not spray!) on these. Works great.

Loctite is a good idea too.

Some rotors have protective coatings that do not need to be removed, but still be careful to clean off any wayward grease.

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1986 300E 5-Speed 240k mi.