My buddy brought his 97 4runner to me the other day with a hole in his soft line and a busted hard line. No big deal, swapped put both lines. But today we went to bleed it after it sat for a few days, and it doesn’t build pressure. I went around and checked for leaks, there were none. All bleeder valves were closed tight. I can feel air coming from the brake fluid reservoir now. The weird thing was, it still built a little pressure before it sat. Is it a bad booster?