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Here are the instructions on now to bleed the clutch on your truck. If it is completely bled out, and clutch still is inoperative, then the clutch master cylinder is bad.
IMPORTANT: Ensure no air is drawn into the clutch system.
You need a new clutch master cylinder. The fluid you put in it is DOT3 Brake fluid. This fluid should be changed about once a year. It is hygroscopic, meaning it soaks up moisture.
moisture = corrosion.
So be sure to check the brake fluid, too... You can get test strips from the auto parts