Well my first guess would be with such little use they froze. I had something similar happen on a Ford Ranger, but it was only one side.
Then this is in the way-back machine, roughly 1970. My dad had some work done on the car right before a trip and the brakes kept locking up once we got started. It turned out the rod going into the master cylinder was mis-adjusted and slowly causing pressure to build up.
I would suspect the first before the second.
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2019 2106 DS
2019 Colorado Duramax
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