Could be a number of problems. Here are a few.
Defective Brake Pads
Abnormal Brake Caliper Action
Excessive Heat
Damanged Wheel Hub Spindle
1. make sure lug nuts are all torqued evenly to the proper spec- do not allow an air gun to tighten!
2. economy (offshore) rotors will warp much quicker, always use reputable parts - you get what you pay for
3. dragging brakes will cause overheating and warping - be sure to service your brakes regularly to ensure free movement and use new hardware - lube all moving surfaces including pins.
4. check for vehicle specific bulletins such as changes to the dust shield (ie montana/uplander) causing excess road debris/salt to attack rotor and cause warping issues
SOURCE: 2002 Lincoln LS rotors keep warping
Warpage can be caused by many reasons, such as getting real hot ( normal ), and you driving though a nice cold puddle. INSTANT warp. Also tightening wheel lug nuts too tight can warp rotors. Should be tighten with a torque wrench to factory spec.
SOURCE: Rotors keep warping. Parking brake=caliper sticking?
well first of all just because they can be turned dosent always mean that you should do it, now a days rotors are alot cheaper to just replace them, however whatch where you buy them. in most cases you get what you paid for, Like cheap rotor prices=less life, same for the pads and how hard the driver uses the pedal. and as for the "classic rotor warp" thats not always the case with these newer cars having more movable joints than ever befor, it could be, bad hub bearing,bad lower ball joint...etc....good luck
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