You are right Davidmc, warping is caused by excess heat, but to answer my own post, there is another reason for this to happen: caliper piston getting stuck, this is what happened to my bike, I already bought the disk and I will buy a new caliper, I don't want to take any chances with rebuilding the old one.
Also, I realized that the bike would be rideable in an emergency, just remove the warped disk, reinstall the caliper, pump the brake lever until the pads touch eachother, and ride to the nearest parts dealer.
Thanks,
Motor.
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