A few days ago, my Xterra wouldn't start. It was making a noise as if it were trying to start, and sounded like it was "slowly dying." My husband took a look at it and cleaned the battery terminals. It was back to normal afterwards. Today, he bled the brakes as sometimes they don't grab and then the abs kicks in. Anyways, he test drove it for the brakes and told me the brakes were fine now but the abs was still kicking in whenever we braked while turning. I remembered that I had put air in the one of the front tires today, and checked to see if the tire pressures were even. Then I went to start the Xterra to see if making the tire pressure equal would kick off the abs, and it wouldn't start. It wouldn't turn over... just kind of making a hissing noise. The radio and wipers work fine. He checked the battery and its fully charged. I checked the alarm system and that's not the cause either. He checked the battery/starter connections and everything was fine there. Any ideas?