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:
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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.
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Look at the front, they have the clips that go into the caliper piston, this also helps reduce high frequency vibrations which is the main cause of brake noise.
Going to do a brake job this weekend (pads and rotors) on my 2017 Audi A4. Just wondering if I should grease the caliper guide pins or not. Don't think Audi makes mention of it, and I know BMW specifically says not to. Was wondering if anyone has experience with Audi/VW and whether or not they should be lubricated. If so plan to buy some 3M silicone paste.
Back to OEM parts...
if the carrier looks like this:
Where the caliper bolted to the guide pin, then every now and then you need to remove the guide pin and relube, to ensure there is grease under the rubber boot.
Not necessarily. Follow the factory service instructions for the vehicle you are working on.