Early design a long time with the fourth technology GMC Yukon may have brake failures resulting from a defective vacuum pump. This informational bulletin advises the technician to check for faults that may be because of the trailer if not found by a possible faulty trailer connector. Examine Extra » https://californialemonlawcenter.com/lemon-law-advice-for-transmission-faults-with-the-2019-2023-gmc-yukon/