F60S Brake Booster
 

We are in the last stages of preparation for Normandy75.
The engine would not run reliably and we eventually disconnected the brake booster in case there was an air leak through it. This improved matters and, as a bonus, the wipers began to work and we could, at least, get a sensible tickover.
So, today's job is to strip the booster down. Has anyone got any advice? Are spare parts available?
Alastair
F60S