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Hello, my name is***** the truck is shaking when the brakes are applied then it is warped rotors. If it is shaking with or without applying the brakes then either something is loose in the front end, or you have a tire issue. I would go and have the tires checked for any separations and also check the balance. It sounds to me like you have a tire that is failing. I hope this helps. Please let me know if you need further assistance.
Have a great rest of your night and please let me know if you need anything else.