It appears that you have a 3/4 ton setup. I was thinking of the 1/2 ton which has the rear brakes fed off of the rear reservoir. Your leak has to be in the lines to the rear or the rear wheel cylinders.
Sometimes rear brakes can be painfull to bleed. I have bled the mastercylinder by removing the lines exiting the proportioning valve and then bleed the rear wheel cylinders.
As long as you are losing fluid you will have problems bleeding the system. I would reexamine everything from the prop valve back for leaks.
Good luck!
JIm
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