Brake job on 66 mustang (inline 6), 9 inch drums, converted to dual master cylinder. All brake lines (hard/rubber), shoes, cylinders, and hardware are new. Adjusted shoes to a slight drag on drums. Bleeds fine but brake pedal has no pressure, wheels do not lock when brake pedal is pressed. I was wondering if anyone has any ideas or if they could tell me how exactly these wheel cylinders (see attached) are supposed to work as I am not familiar with these. I thought the wheel cylinders could be the issue because only one side compresses and releases.
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