The main symptom of warped rotors is a pulsation felt in the pedal when brakes are applied. If the vibration is felt in the steering wheel and pedal, it’s most likely a front rotor problem, if the pulsation is in the pedal only, it is most likely the rear rotors. Either way, only a dial indicator test can show whether the rotors are actually warped, or it is another problem. (max. dial .1mm)
Brake rotors don’t warp unless overheated. It’s very common to misdiagnose tyre or suspension problems and attribute them to a warped brake rotor. Warping is caused by excessive heating of the brake rotor and the resulting distortion of the cast iron.