I picked these up in hopes they were something else (4-piston Brembos, that I could install on my e36/7 roadster). They came off a 1982 7 series. I was told the seals were replaced about 5,000 miles ago and I've verified none of the pistons are stuck. I've also spent some time cleaning them up, so they look half decent. Is there any demand for these things?
I know the later rotors and calipers from a 750il make great replacements for an E24, but I am uncertain about the earlier 7's.
Not sure if there is much demand. But don't throw them out! Put an ad in market place and Roundel. I am sure someone could use them. Even ebay would be a great place to get rid of them, but still going to someone who needs them.
