Hi.. Just had the same problem and saw this post from 2014 and it's now April 2021..On reading the threads I thought I'd check out some of the advice before forking out for new discs and pads as I also had the same though.. warped disc..! I am very happy to report it was a rusted area on the two front discs. They looked OK on first glance but when I started with the wire wool I found an area that gave resistance to my polishing.. Then I used some medium rough sand paper and behold under the blackish sheen there was a rusted surface. It was where the disc pads were at rest when the car was laid up for about 3 - 4 months. Must of been put away wet.
Any way a happy ending thanks to this original post.
That's the really good thing about the club and these forums.. Thanks guys... Mogmike
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