PST isn’t the manufacturer for the rotors or the calipers, and I seriously doubt they inspect every single caliper and rotor that they’re supplied. If there’s casting issues, the parts are being supplied to PST that way.
I see the original post has been modified, but I doubt you’ll get much help unless you describe the problem you’re having and include pictures. PST has provided a lot of parts to a lot of people, and I’m sure their brake kits have been installed without issue many times. Could be you got bad parts, incorrectly boxed parts etc, because that happens. No perfect system for that. It could also be that the parts are installed incorrectly, and without pictures no one here will know.
You don’t have to blame the supplier, just show us the issue.
