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Originally Posted by BMW_E53
Lol I am hoping for the same as well! The last time I replaced the pads and rotors the boots looked ok and whenever it rains its usually just light sprinkles haha. But if there is light rust or any dirty marks, could I use brasso to clean the piston?
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Unless you have silicone brake fluid, regular brake fluid is very hydroscopic which means it absorbs water vapor from the air. That is why you don't leave a bottle of brake fluid uncover once you open it.
If you can polish out the rust you can probably reuse it, but if you have pit marks on the piston you can't reuse it. For peace of mind, I normally don't reuse pistons that have rust on them. For my PORSCHE I installed stainless steel pistons.