On the odd few cases where I've seen genuine discs that show symptoms of being warped - they're not warped at all. It's corrosion on the disc surface that causes non-uniform friction across the surface, and with use this leads to small variations in the disc thickness.
https://www.apecbraking.co.uk/Resour...ke-Judder.aspx
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2011 XC90 D5 Executive
2003 C70 T5 GT
2012 Ford Ranger XL SC
1977 Triumph Spitfire 1500
1976 Massey Ferguson 135
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