Originally Posted by
KX5062
The rotors can warp on one side only if the caliper/pads stick and cause the brake pads to drag and overheat the rotors. If the caliper is sticking on the one side and overheating, that will cause the problem you describe.
The good news is, it's an easy fix however. A full disassembly and a good cleaning and lubrication of the appropriate parts should solve the problem, if it exists. (Many shops just throw parts at a problem without going the extra yard to figure out why.)
The bad news would be the rotor would need to be replaced again, but not necessarily the pads. That would depend on the wear. I would suggest, like Ron said, replacing it all with EBC rather than OEM. OEM is Brembo, which is a top notch company, but who knows if BRP/Brembo is sourcing their parts in China and just relabeling them under license.
(The original Spyder brakes were a kind of Chinese Brembo knock-off that were rather garbage.)