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Hey so I have a 2007 Honda Civic ex and I'm getting that same sound in reverse.. however it only happens on initial start up and reverse. If I have been driving for a couple mins and put it in reverse no sound it's so weird. I pulled off both back tires and I didn't see any sign of a rock or pebble. I spin the rotor and it didn't make any sound while the tires were off. But as soon as I put it on and started to back up the sound stated again

 
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Check all 4 wheels, look for a shiny ring on one of the rotors

 
Rep Power: 367

does it happen when moving forward?
is it after rain?
moved to your own new thread because:
you posted in 7th generation, you have a 8th generation, different animals.
You revived a thread from 2005, many eons ago.

 
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I checked the back rotors yesterday.... And the 2 front ones are like 1 or almost 2 months old so there should be any on the front ones... But I'll check thanks

 
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No it only happens as I start up the car and reverse... It wasn't raining

 
Rep Power: 367

take to a mechanic for diagnosis?

 
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That's the next step