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/// I don't have your model. What you describe is not possible, unless...
If the rotors are warped then the brakes will pulse all the time unless you also have a frozen caliper that sometimes refuses to operate. Then you would have no brakes on that wheel while it is frozen. (This is a sliding caliper, right, one big piston?)
It is not possible to look at the rotor and decide if it is warped. It is put on a lathe and rotated. Alternately a radial run out dial is mounted on the caliper (magnet) and the wheel of the dial placed against the front rotor surface. You can read out the warpage as the difference in the high and low measurement.
Putting a micrometer on at several points tells you the rotor thickness. The minimum thickness allowed is cast or stamped in the rotor. Usually this is at the point where the wheel lug cap meets the flat rotor surface at the rear of the rotor. Sometimes sandpaper is necessary to read the numbers.
Warping is caused by heat. Heat is caused by a caliper failure. The usual case is that the caliper fails to relax to the position before the brakes were applied. Brakes on that wheel are then on, or partially on, all the time until pad material wears off enough to clear the rotor. This can be caused by several problems both inside or outside the hydraulic system. (Rust, pitted pins, over sized bushings, worn pins etc.) If you service the warped rotors but fail to repair the cause of the caliper failure and heat, you will warp the repaired rotors in short order. (very few miles)
Be careful, brakes must be right all the time.
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