model year difference more likely. I have a 2020 3500 DRW and the pedal is far from firm, definitely not at the top.Note that I dumped the 2019 2500HD for a 21 3500HD dually. The brake pedal is massively different, very firm, and his right at the top of the travel every time. It may be a hit or miss, or maybe the dually has different parts that equate to a much better feeling brake pedal.
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note also going from a 2500 to a 3500 is apples to oranges