Well, after a few very frustrating weeks, the car is back together and I have some good brakes with a good firm pedal.
Just let me explain what happened. I took the booster, some call it the brake servo unit to a firm that I have had many previous dealings with, and an owner who knows a great deal about classic cars. He indicated he could repair it.
After waiting over a week, I called & he said it was the most difficult unit he had ever tried to repair & couldn't get it just right. He promised to have it done soon. I then borrowed several other old units from one of the Capri Club members & took them over to the workshop to see if at least one could be salvaged.
Another week went by, and no booster but promises that it would be done by the weekend. Still no booster. I then rang to say that I was coming to collect them all when the owner indicated he had admitted defeat & had outsourced to another repairer. Two days later I had them all back, however two are in bits. Better than not having them at all. Very frustrating!This is how they look in bits.
This is the parts manual exploded view.
It all went back together without too much drama but the biggest hassle was the pin that holds the clutch pedal in place. For some reason, there was very little clearance for it to fit in the groove, but after trying the plastic sleeve several different ways, I finally had it slide in.
The brake master cylinder fitted back on very easily and the pedal firmness is very good. No more hissing or fading pedal. I should have had it repaired long ago.Now onto the next project - my white Capri is running like a hairy goat!