front disc warpage

[snoman6115]

any ideas wt would cause my front right rotor to warp and cause it to grind? ive narrowed it down to either the rotor or the caliper cuz i took teh dust sheild off which had a small scrape on it and thoguht it was that. then witht eh tire off and manually turning the brake i can feel a slight grind. new rotors and pads in Dec 08 and the pads still look very good

 

[Sasquatch_Ryda]

Seized slide pins on the caliper bracket, or a seizing/ dragging caliper causing heat to build up.

 

[robertc1024]

Air in the line? I had the same issue on my Maxima - right front rotor warped, left not - turned out I had some air on the right side. Bled it and all was good.