Scraping metallic sound?!?!

[mookie]

Twice now i have heard a scraping metal sound on my car. Both times it has sounded like the exhaust has fell off the car and i am pulling it along behind me! Have checked under the car and there is nothing easily identifiable (not a car whizz though). The sound is pretty loud but both times it has only been for a short time and both times it has been when going slow (straight line) first was slowing down to a junction and second was driving into work (over speed bumps).

The car is a MKII cupra 57 plate and has only done 15k.

Any help would be appreciated.

 

[SeanCorky]

http://www.seatcupra.net/forums/showthread.php?t=213705&highlight=stone+brake

 

[mookie]

Cheers dude i was crapping myself! Strangely reversing into the parking space was when it went away!

 

[lard-ajc]

same happened tome - small stone lodged between the brake disc and the metal plate behind the disc - a bit of persuasion with a screwdriver and it was out