Back to Audi/VW, why do the fronts pins not require lubrication? Are they not lubricated from the factory? I looked in the factory service manual and it lines up with what you said - there's no mention of lubricating the guide pins in the front brake section, but it does say to lubricate them in the rear:
View attachment 60504
I also noticed that the manual makes no mention of lubricating the front brake pad backplates. It does however say to coat the rear brake pad backplates. Both the front and the rear have rubber shims installed, but maybe it's because of the metal clips attached to the fronts? Interested in your thoughts.
View attachment 60510
View attachment 60511