Brake pedal goes to floor. Front breaks work, Back do not.

by Andy

My 76 corvette sat for years. Had trailing arms replaced. The place that did the change said they did nothing to my breaks but since I got the car back, NO BREAK PEDAL.
I replaced master cyclinder 2 times, replaced power booster, rebuilt calipers. I lose no fluid. The back breaks just do not work, I bleed calipers, pleanty of fluid at calipers, no air.
Could it be bad proportioning valve , emergency brake adjustment? I have no idea. Vacuum is strong, replaced vacuum on booster. Bled the hell out of system. Nothing changes.
Please help.

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