If you've already checked the bulbs etc... I'd check the ground wire(s) or make sure the bed ground (to the frame up front) didn't come loose. If it's wired for a trailer, I'd check those connections.
Hi, the brake light circuit runs through the 4 way switch, and this switch can go bad, there was a recall on them at one point, try wiggling the 4 way switch, and see if this makes a difference. If you see it does, you should contact a dealer to see if it is subject to the recall. Good luck...Coop
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