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[24_Valve]

My drivers side front brake disc is making a nasty scraping noise.. sounds like a crushed coke can scraping against the disc. I removed the wheel and slowly rotated the disc itself and the noise is apparant for about 1/3 of each rotation with very slight resistance while noisy.. pads are a little worn but never heard this sort of noise before. No noises when braking & passenger side is fine  :question

[markspark]

have a look round the rear of the disc the dust guard may be catching
Is there a wobble on the steering wheel when the brakes are pressed whilst driving??

[tidla]

you would be suprised where stones can get! as above check the backplate if all mechanicals are a ok.

[24_Valve]

no wobble, but will check dust guard  could worn disc pads scrape like this  :question never known them to

[markspark]

yes they would cause a noise like that  metal on metal not good

[24_Valve]

don't want scored discs so if the dust guard is clear i'll fit new pads. warning from pad sensor hasn't come on & only scrapes through 1/3 of rotation

[markspark]

sensor may not be working correctly it could have been by passed at some stage in the cars life

[24_Valve]

fair point 

[markspark]

only 1/3 of rotation is a sign of warped disc thats why i said about wheel wobble whilst braking whilst driving

[24_Valve]

had crossed my mind, i'll look for uneven wear on the pads. if need be, also replace discs.

[Bionic]

  Its probably a stone lodged between the disk back plate and the disk. Thery can flick off the road and adhere to the backplate from a newly surfaced road.
If there is no wheel wobble and the pads are of a good thickness a stone is the better probablitiy.
5 minutes to check and put yourself at ease.
Wear sensors will not cause this noise!
GudLuk

[24_Valve]

Cheers mate