One of my front brake calipers has a dragging piston and Porsche does not offer the seals for the pistons, all you can buy from them are the ‘dust cover seal kits’
Do you know where can you buy the seals for the Brembo pistons?
I had that problem last year and used the Cup Car solution: Just cut off all the remaining toasted and carbonized dust seal material that may be interfering with piston movement. Problem solved. Cup cars don't have dust seals because they overheat easily doing track work and get in the way.
Stop Tech may have the Brembo seals but you probably don't need them. Toasted dust covers are the enemy #1.
__________________
2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.