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There's a problem with your clutch hydraulic system, either the clutch master cylinder or the slave cylinder. See if the reservoir is full (takes brake fluid), and if very low, may have a leak and should be bled down at the slave cylinder. And check for external leaks, as that is likely the cause of brake fade. If no external leaks, and filling the reservoir did not help, then either the master or the slave has a seal that is not holding pressure, but leaking internally. I don't know if there is any way to test to see which is bad, so you might try a new or used slave cylinder first, it's cheaper than the master.
The clutch master cylinder is located on the firewall in front of the clutch pedal and has a solid plastic line (hose) that runs directly to the clutch slave cylinder which is located inside the bell housing of the transmission. Unless it has rubbed against something and developed a leak, which is very unlikely, the leak will be at the slave cylinder and drip from the front edge of the bell housing where it meets the engine. This is a common problem with older Chevy trucks and the best fix is to replace the entire hydraulic system with a pre-assembled unit available at most parts suppliers. These units come with the master cylinder, hydraulic line and slave cylinder with a new release bearing (throw-out bearing) and are pre-bled and full of fluid. Replacing just the slave cylinder is a major job and bleeding these systems have been known to drive people crazy. Replacing ALL of it aint much more work and saves your sanity not to mention all those dirty words.
If you have replaced the slave unit, and bled the system, then I'd replace the master cylinder on the firewall and bleed it again. It seems though that you are a bit week on the diagnostics end...A slave unit is bad only if it is leaking fluid or frozen from non use. A bad master, can either leak externally (usually visible where the rod goes into it on the passenger side of the firewall) or internally bypass causing the slave not to move. The line between them cannot be leaking either or nothing will work. If everything appears to be working but the clutch will not disengage it is possible that the clutch itself is bad.
If you have bled the system, you are down to either having a bad clutch master cylinder, or a bad clutch slave cylinder. You could eliminate the slave cylinder by removing the line and capping it off, and if you have a firm pressure on the clutch pedal ( don;'t try to push it down, just check for pressure!) then your slave cylinder is bad. If you cap off the line, and bleed the system, and the pedal still has no pressure, then your clutch master cylinder is bad!
check the clutch fluid level. if its empty, you have a leak, and you have air in the system. if there is no leak, and the fluid level is full, the problem lies in either the clutch master cylinder or slave cylinder.