Hello,

I'm embarking on the wonderful adventure of Rotor ID. I've got an 87 745 with Girling front calipers. My rotors are pretty beat and hopefully the calipers are still useable and removable!!

At any rate the rotor is pretty old and I know with the 2 piece type there are variations in the diammeter that have to be matched. My problem is that there is a layer of rust on the outer edge that hampers getting an accurate measurement of diameter. Does anyone know if the size is stamped elsewhere or what are the most likely sizes for this model. I've seen some bargains on ebay for 10" rotors, but checking the FAQ here I don't see a 10" listed?

Any advice much appreciated!
Mike

Your car would have originally had the 10.25" nominal diameter rotors. You can use the later caliper holding brackets to upgrade the brakes to 11.25" diameter. Bendix and Girling calipers use the same rotors.
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john

Go to 700/900 FAQ on this site and look up brake rotor size. Note there is a mistake for the 940 listing, but otherwise seems accurate. You can use this to confirm your measurement. Also, FCP site lists all rotor for all years, may help build confidence in what you need.

Chip off the rust down to close to bare metal and measure diameter at that point. Rotors came in 1/4 inch increments, so you should be able to get an accurate-enough read.