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On the GMC 2020 Sierra, you need to modify the settings on the dash info display. Create a profile for your rig. Weight, length, height, etc. and as mentioned, set the brake gain. Once you create the profile it is good until you change the rig. That should fix your problem.
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Bob & Angela
2022 3813MS, 2020 GMC 3500 Denali SRW LB
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