E30 Zone

Hi all
Please can someone help, i recently bought a 325i cab, but when im driving and just when your about to change gear sometimes the clutch is very soft and just drops down, even when stationary if you rest your foot on the clutch pedel ever so slighty it just it just drops down.
please please can someone help
cheers

New clutch master cylinder required. It has an internal leak past the main seal.

The cap on the clutch resevior is known to split with age/by being tightened too much if its empty and air is entering the system, i think these syptoms may also occur ??

Split clutch reservoir cap will allow moisture to dissolve into the clutch fluid, and also allow in dirt and grit as well; both of which will hasten the end of both the master and slave cylinders.

cheers guys, are these big jobs to get done?