1963 brake booster blockage?

[Karsten22]

My brake pedal on my 63 cab gets blocked mechanically after a while. It is as if there is a blockage in the brake booster. I have to release this blockage by a powerful press on the pedal. Then it works again, but the error comes back after some driving. Do you have experience

 

[biddle]

Pretty much everyone has a problem or a question. Put what your problem is in your subject. Your subject "1963 Brake problems" has been revised.

 

[74 Harley]

Do you have vacuum or hydro boost brakes? It sounds like it is time for some flushing and rebuilding.