Clutch drops to floor - 1991 Toyota Pickup

One of two things is wrong with your truck. Either the hydraulic clutch has a worn component that needs to be replaced or the clutch is slipping and needs to be replaced. If this failure only occurs while towing. I suspect the clutch is slipping, heat from the pressure plate is heating the fluid inside the hydraulic clutch and causing it to drop to the floor. Some diagnostics is needed to confirm.

there is a small tank to put fluid in should be on the firewall if the pedal went to the floor the line broke or the slave cylinder for the clutch went bad

Your Clutch slave cylinder may be bad.here's a link to it. SAVE 20 GET 10 GIFT CARD ON ONLINE SHIP TO HOME ORDERS OF 100 OR MORE Here's a link to a new one. http://www.autozone.com/drivetrain/clutch-slave-cylinder/duralast-clutch-slave-cylinder/nissan-datsun/maxima/2005/6-cylinders-b-3-5l-sfi-dohc/557935_0_0

check the fluid level in the clutch reservoir- Denny

Sound like you're going to need a whole new clutch assembly, but if the fluid level was dry you may have sucked air into the system which means that the clutch will have to be bled at the slave cylinder, just like you would brakes. The squealing sound is coming from the throw out bearing, usually when the do that it means that the bearing is frozen and cannot spin. Either way it looks like you'll be dropping the transmission to work on the clutch.

It's usually the clutch master or slave cylinder that is bad when the pedal drops to the floor suddenly. Check both to see which one is leaking fluid and that's your bad one.

you still have air in hydraulic system you need to bleed clutch again can take few trys

Broken linkage, or the clutch itself has failed.

there may be a leak or whole in your clutch line to the throw out berring.