Awhile back I had a leaking booster that I had replaced, and everything
was all good.
Now I return from a month vacation and it appears the booster is not
due to a hard pedal action. The vacuum line is not leaking and the check
to be working as well. Before I replaced the booster there was a hissing
from the foot well, but all is quite now, which would suggest the
diaphram is intact.
I did apply a vacuum to the line to the booster and it seems it pulls
air continuously from the booster.
Is this normal???
I thought that the vacuum would draw the sealed air from the booster and
a set vacuum. It seems to me that the shell may be leaking.
Can anyone suggest any other tests?