NHTSA Complaint #11686046 — 2023 CADILLAC ESCALADE

So I bought this Cadillac Escalade V 2023 with about 26k miles on it and I only had the vehicle for about 13 days and I got a light on my dash board and I had a mechanic check this for me and he told me that the whole entire break system was failing and needed to be replaced so I then took it back to the dealership I bought it from and they told me they had no idea since it was a certified pre owned and we where all confused about this situation and I was very unhappy that I paid 128k $ for a car and the dealer told me they could fix the issue or take the offer of 105k$ he offered me and of course because I did not want to have this problem I got rid of this vehicle as quick as possible I did not notice anything wrong with the car physically but I had that check engine light on with 13 days of owning