You have a split master cylinder on your jeep. One half feeds the front brakes, the other half feeds the rears. You can have fronts an no rears, or visa versa, it's designed that way, so if one side fails on the master, the other will still work.
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.