[emt1134]

I know some people get away with reusing the old ones, but this is usually never a good idea.. I say this because the old copper washers were conformed to the old caliper... Using the old washers on a new caliper will not mate correctly and there will be little gaps where the fluid will leak through... i don't know what brand caliper you bought, but they should have given you new washers along with it... since they did not, they are idiots.... Here is the AC Delco part number for those washers: 21012386.. Either go to your local parts store and get them, or order them online.. Let me know if you need any more info