Brake skid occurs most often on dolly, trailer and drive tyre. Aggravated by new brakes (high friction, not worn in), unbalanced brake system, aggressive use of brakes, frozen brakes and driver abuse such as the use of only trailer brakes to stop a vehicle. Sometimes seen on new vehicle drive-aways.
If condition is not excessive, duals can be rematched to position flat spots 180° from each other. If more severe, the tyre can be repaired or retreaded if damage is not into the belts. If skid damage is into the tyre belts, it may be possible to remove the top belt and/or rebelt the tyre. Consult your retreader. If damage is excessive, scrap tyre.
Check brake material and brake balance.
Review driver training program.