Master cylinder have 3 sections. front, back and proportion valve.The valve control the pressure to the rear brakes.Start bleding from the master cylinder. if the pressure is good inspect the line for damage.if one line don;t have pressure replace master cylinder Good luck
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Master cylinder have 3 sections. front, back and proportion valve.The valve control the pressure to the rear brakes.Start bleding from the master cylinder. if the pressure is good inspect the line for damage.if one line don;t have pressure replace master cylinder
Good luck