I have a '94 BMW that has started having a VERY random problem where the clutch pedal falls to the floor when I go to use it. I put my foot on the pedal, and it simply falls to the floor. I can put my toe under the pedal and pull it back, and then it works again for many dozens of applications, when it falls again.
The return spring holds the pedal up okay, and what seems to happen is that when I get past the part of the travel where the pedal is pushing the piston in the MC, that's when the pdeal falls. It falls so fast that it could be described as beinig sucked down. I have never felt this behavior before in any of the dozens of cars that I've driven over the several decades of driving. I don't need to get into a flame war, but it's likely that I've driven more different makes and models of car and truck than anybody on this board -- my Dad was a Used Car dealer when I was a kid, and I've driven literally hundreds of different cars. The point is that I have a very broad base of expereince to call on, and have never had a fluid-based clutch system behave like this, so I'm not sure what the problem is.
I'm inclined to go with a failure in the clutch master cylinder as opposed to a broken clutch fork. My reasoning is that a broken physical part would cause a constant fatal problem, not a transient annoyance that is easily overcome and that allows "normal operation," after getting past the annoyance.
What do you think, bad MC or something else?