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Duramax Seventh Generation: 2020+ (L5P)I have a 21 2500 GMC. I have hooked it up to several trailers and the trailer brakes do not engage unless you mash the brake to the floor with the gain on 10. I also have a 04, 3500 Silverado and the brakes work fine with this truck. I have had it to the dealership 3 times. I’m afraid to drive...
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