1985 Toyota Pickup clutch

I think your low on clutch fluid. On these trucks you can usually fill the clutch master cylinder with brake fluid then slowly press clutch pedal and it will bleed itself out and work. The clutch master cylinder is next to the brake master cylinder under the hood. Your problem is you have run out of fluid because of either a very minor seepage or your clutch master cylinder of slave cylinder is leaking. Let me know how you make out