Thanks for all your previous suggestions, but I still need your help.
Well, I finally managed to fit a replacement Master cylinder and what a pig of a job that was . Now though, the problem is still not fixed, because when I try to refill the clutch system with fluid it just disappears somewhere. I have checked under the pedal and in the engine compartment and also under the car but no sign of any leaks. The bleed screw is fully open but no fluid is coming out, it's as if the fluid isn't reaching the Slave Cylinder at all. So where can it be going I have now put nearly 1ltr of fluid through but no pressure resistance from the clutch pedal at all, it just drops to the floor when pressed. (the Breaks are still fine and the fluid in the reservoir never drops below half way).
Could it be leaking into the Vacuum Servo enclosure when under pressure instead of getting through to the Slave Cylinder (just a thought)
How much fluid should it take to refill the clutch system and could you please tell me what this drum shaped object is on the high pressure pipe (see attached photo)
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Your continued help and advice is much appreciated,