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+1 Devilbox
Listen to see if the sound occurs again. If so...than it is not a rock caught in the caliper, but more likely pads (check the inside pad too) or a wheel bearing. The wheel bearing makes a "crunching" sound that will alter its frequency at different speeds. I had an Audi A3 that had the bearing go out at 12K miles, so you do not need a lot of miles to have a bad bearing.
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rob76turbo
Current Porsches: 2002 Boxster S (Speed yellow)
Past Porsches: 1972 914, 1987 944S, 1976 930, 1986 951, 1999 986, 1992 968, 2001 986 S, 2006 Cayman S, 1986 951 track car, 2001 986 S, 2005 Cayenne
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