I have had at least 3 that have leaked so far. Everyone I have bought so far has been assembled and never tightened up.You would think they would be a little more critical with brake parts but what do they know about making brake parts where they are made. They ride bicycles.This has been a ongoing problem for at least 3 years. I would keep sending them back until you get one that does not leak. If they are going to sell you junk parts that they know have a problem. I would make there job difficult and make sure they loose there profit in shipping cost. They don't care about your labor.