Brakes 1996 Toyota 4 Runner

[mike53]

vehicle was brouht to me with no brake fluid in master cyl looked over no leaks but found calipers froze hoses cracked rear shoes not making contact no leaks replaced calipers hoses and master cyl no leaks at master also pedal stiff then fades to the floor pressure bled gravity bled no brakes went to dealer not any help cant find any load sensing valve brakes adjusted no weak wheel cyls bled good clean fluid booster dry where did fluid go and whats up with no pedal any body out there got an idea