Well, I changed the master cylinder which was old and leaking. I took the car for a drive and everything was fine, after about half an hour and 10 miles away from home, the pedal went all the way to the floor again.
I drove home very gingerly and after a while the pedal rose again.
Can we agree that I need a Brake Booster or do you guys think I have another issue.
Where would I find the Brake Booster Hose? I have searched and it seems that no one has this part. Would it be a stealership only item?

Thanks in advance.

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1976 280C
SLOWER DRIVERS KEEP TO THE RIGHT.
DRIVE RIGHT PASS LEFT