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please help

  1. Unknown valve

    Noobie Bronco Tech Questions. Flame free zone!
    I found this valve while i was crawling around under my 92 351. I've been having an issue where when i brake really hard both my parking brake and abs lights come on and my brakes get really heavy and my abs is craps out. I figured maybe this valve has something to do with it and if not I'd love...