no fluid to rear

try resetting the metering/proportioning valve, remove valve, remove banjo bolt and spring from valve, pull or push plunger in the valve until you can blow thru the rear inlet port and feel air coming out exit port to rear line. it doesn't need to be set perfect, it will reset completely when system is bleed. you want to make sure that when you start bleeding the brakes that you DONT push the pedal all the way down to the floor or the valve will lock up again(it`s the safety inside the valve that senses low pressure), only push pedal down a couple inches and hold. filling the master cylinder and opening both rear bleeder screws with all lines hooked up (gravity bleeding)and walking away for a half hour or so until the master cyl fluid level drops at least half way is always the easiest way to keep the valve from locking back up on you. then you can top off master with fluid and open front bleeders, walk away again for a while and you should be all set.