Try a vacumn pump bleeder to see if there is a pluged line. When pump up the vacumn it should pull the fluid back to the rear, if not and the vacumn pump shows a vacumn, you will need to start looking for a plug brake line.
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Allen D
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64 Galaxie 500 with 428 FE
66 F-100 4x4 With 67 GT 390 Hi Pro and Toyota Power Steering
67 F-100 2wd for parts
68 F350 crew truck
80 Bronco with a 460 engine
90 Aerostar With 4.0
91 Aero 4x4 with 4.0
93 SHO Taurus
07 Mustang with 4.0
| 
no brake fluid to rear brakes 
Linear Mode
