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BTW, there's a wacker that I work with (I'm at work) who used to be a diesel mechanic and he reckons they used to re-use their copper sealing or crusher washers all the time. What he has suggested I do is clean up the washer as has been suggested using say, wet and dry etc and then put them on a coat hanger and heat them up using a gas torch till they glow an orange colour before dipping them in water. This process called anealing softens what have become hardened washers due to the heat of the motor they were in, so they can again give a proper seal with the banjo bolt.




Uuuuuuhh.. okay.. sounds like a lot of trouble to me and having been a diesel mechanic, I've never heard that particular method but it seem that the heat would distort it and the water would temper it making it harder... but I'm not a metallurgist so what do I know?
As long as they are flat and round, they'll be fine.. after all it's only like 8 nm of torque right?

On a side note.. I would never reuse them more than once.