If it doesn't work I guess I'll have to try another caliper. These are remanufactured calipers so I'm sure some of them have been in service a long time and may have more pits than other at the sealing surface. I didn't see anything when I removed it but I can't really tell. There's no source for an NOS or new floating caliper like this anymore. Even if you find NOS I don't think it's complete, it's just the housing.