So two weeks ago I started hearing this knocking noise coming from my jeep when I would be idoling in first or second gear. I wasn't to sure of what it was. Then the brake light came on while I was driving one day. Finally while driving at about 35 mph there was a sort of bang and now there is a constant noise. It kind of sounds like the rear brakes are stuck. But sometimes it makes a different kind of noise that sounds real bad. Any ideas on what it can be? My plan is to start by taking apart the rear drum.