I would immediately check that everything has been tightened down to spec. New rotors are known to have become warped just by sitting on uneven shelves or improper storage. That would've been my first thought but you said everything was fine right off the bat. If the rotors you got were indeed warped from the get go then you would've had that symptom from the first test drive. Sounds like to me something has come loose. Did you also replace the hardware such as abutment clips? If you did'nt then you might want to look into getting those replaced.
I am interested in hearing your source on the underlined part. I believe non-true rotors right out of the box but I am not quite seeing that for a cause. I did a little searching online about this and see some info on this but nothing from the right kind of source to convince me.
2006 Taurus SE Vulcan 44k Silver Frost Mods: Mach Stereo, Homelink lited visors, Gentex Comp/Temp Mirror, Lloyds mats and trunk liner, Hella driving lites, Derale Trans Cooler
2003 Taurus SES Vulcan 52k Arizona Beige Mods: Mach Stereo, Comp-Temp mirror, Lloyds Mats & Ford trunk liner, Hella driving lites,
1991 Taurus 3.8 GL 205k weak trans but still kicking
1988 Taurus 3.0 retired
1996 F-250 Powerstroke 75k lots of mods like new
2009 Impala LTZ 3.9 12k
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Last edited by Tom S; 12-18-2012 at 02:20 PM.