Has anyone ever actually been able to either see the pebble stuck in the brake shield by using a small trouble light, or removed the shield to see the pebble fall out?
Obviously some of these cases are pebbles, and some are not. For some folks who have recurring problems, it seems more likely that it is something else that happens to come and go. I realize other causes are discussed in this thread already, but it seems the vast majority of folks are willing to buy that it is a pebble in their case without ever really being able to verify it. Just an arbitrary, salient point to consider.
2008 Interlagos Blue E93 M3 - M-DCT
2011 Salsa Red Jetta TDI Sportwagen - DSG