My MKIII would make alittle noise from time to time and that was with the OE Lockheed pads. What I did was to turn the chrome plating off the disc, front and rear, and have used EBC, or Ferodo pads, no more noise. Plus the cast iron surface is better than the chrome that wears off after 10.000 miles.
Alittle paint on the edges where the pads don't contact the disc will keep them from rusting.
Ken G.