1987 nissan pickup- clutch worked fine one day, next time the pedal went almost to the floor with no resistance, I had about 1" distance from the floor to disengage the clutch. checked the master cylinder when the pedal depressed, fluid did not move. no leaks to the slave cylinder. I could easily move the clutch release lever.

`Did it bleed, did fluid come out in a steady stream? Isn't there a spring to bring the pedal off the floor?
Check the linkage of the pedal to rod to the clutch master cylinder, make sure that is all together. Any chance the master has an internal leak and won't build hydraulic pressure down at the slave? If you get it bled, then watch the slave operation while someone works the clutch pedal. The piston on the slave should extend and push the clutch fork enough to disengage the clutch.

Could be the clutch cable

It sounds like the throw out bearing separated. You will want to change the clutch and pressure plate when you replace the throw out bearing.

Sorry we have no parts locator service here.

Sounds like the hydraulic fluid may have leaked out of a line or the slave cylinder is leaking, or the master clutch cylinder has an internal leak that doesn't actuate the clutch effectively when the pedal is pushed to the floor.

The problem is either the clutch master cylinder or the line going from the master cylinder to the clutch slave cylinder.Put some DOT 3 or4 brake fluid in the cylinder under the hood and have some-one look at it while you push the clutch pedal down a couple times. You should be able to see where it is you are losing the fluid.

I traced a similar problem in my truck to a rubber bumper on the clutch pedal which had disintegrated so the disengage switch was not being closed, preventing the ignition from working.

I bent a piece of aluminum flashing to contact the switch when I push the pedal to the floor and it works every time.

check the mechanical leakage at the clutch housing for binding and wear.

you may have a weak clutch master cylinder

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