You have a leaky brake line somewhere. You will need to find and repair it. If you don't see any lines that are wet, you may have to pull the rear brake drums to check the wheel cylinders. They can also start to leak but are not as likely as a line. If your truck is a standard it's possible that your hydraulic clutch uses the brake master cylinder as a resevoir so check that line as well. A soft pedal would suggest that isn't the problem but if the fluid was low enough air could get into the lines. Hope this helps.
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