Another thing I've just found out reading through the FSM - the sealing ring between the master cylinder and the brake booster should be renewed. If you've been having vacuum problems as well as the brake problems this should be something you should take a look at before replacing either a master cylinder or a brake booster.

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!