What might cause warped disk rotors on a truck ?

Service tech suggests "excessive braking" or riding the brake and accelerator at the same time to cause overheating. But so what ? I've seen brake adverts with the rotor running red-hot. In any case, it's a supposedly inspected pre-owned vehicle, and I don't drive like that. Problem showed on... show more Service tech suggests "excessive braking" or riding the brake and accelerator at the same time to cause overheating. But so what ? I've seen brake adverts with the rotor running red-hot.

In any case, it's a supposedly inspected pre-owned vehicle, and I don't drive like that. Problem showed on the first big downhill.
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