Chevymaffia

2015 Tahoe LT 5.3l 4x4 Happened to me this week. Nov 28th in stop and go traffic I lost boost and rearended someone at about 8mph, initially going about 15. Someone on here said there’s no safety issue and you just need to press harder, negative. I stood on it and I got physical pushback from the pedal. I had notice in the last month I had some unusual brake fade, mostly at very slow speeds in parking lots, and possibly in 4cyl mode. So a month ago I had the GM service department at James Woods Chevrolet inspect the the vehicle with an oil change, that gave me the all clear. Today, Nov 30 2018 they tell me my vacuum pump needs to be replaced... NO s*%#! Now granted.... I have 107,700 miles on my tahoe, but these are all cruising speeds cross country visiting family in MD to Vegas to MO, all from Dallas. Very little stop and go. My average speed on the vehicle is 46mph. Just a touch over 3 years old, and this failure happens. Unacceptable. Especially since my 2007 Silverado has over 200k miles, my old 2004 Silverado has 280k miles, my 92 Silverado has 170k miles, my 2009 Avalanche had 190k miles, and none, not a single one has had a vacuum issue of any kind. Im keeping the parts on hand and going to push this issue further. Also reported the incident with DOT