I'm installing a set of remanufactured calipers on my rx7 and the connection between the caliper and the hardline is leaking. I check the line and like caliper fitting and there doesn't seem to be any damage. I wanted to know if there was a way to test the caliper fitting or the line fitting to know which one is bad. It'd be easy enough to order a new hardline but the caliper is a little more difficult to return and get another one. Any suggestions?

 

I would make sure the fitting is nice and tight. Clean it really well and check again. If it still leaks I would swap the line. I'd be surprised if it was the caliper fitting.