Finally got 5 mins to have a look around the booster today , i can't see anything out of the ordinary with the small elbow hose , nor the hose that runs back to the inlet manifold .
It has a high brake pedal without engine running , start engine , no decrease in pedal height , which leads me to think that something is going on internally with the booster , just no idea if it's in the
diaphragm or the m/cyl part .
With engine running , depress brake pedal ,engine revs increase by a couple of hundred rpm's
.