My guess based on the information provided is that you didn't cook it long enough. Although cooking by temp, especially on briskets, is not the best way it's certainly an adequate way to guess doneness. And 175 is way under cooked. You're going to need to get that brisket somewhere around 195 to 205 (normally, but again temp is not the way to measure doneness).
Others will chime in here...
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