I hauled a trailer about 40 miles and when I went to leave the clutch pedal went to the floor no resistance and wouldn't disengage clutch master cylinder has fluid throwout bearing has been making noi

check the slave cylinder adjustment as normally there is no adjustment on the piston rod
There should be about 1/4 " free play between rod and throw out arm
the pivot bolt for the throw out arm should never be adjusted
what you have indicates air in the system or a faulty clutch master cylinder
you can get the clutch slipping indication if the compensating port in the master cylinder is blocked which holds the fluid in the system and keeps the clutch from fulling engaging
no resistance is air in the system and that can be from a faulty master cylinder

`Did it bleed, did fluid come out in a steady stream? Isn't there a spring to bring the pedal off the floor?
Check the linkage of the pedal to rod to the clutch master cylinder, make sure that is all together. Any chance the master has an internal leak and won't build hydraulic pressure down at the slave? If you get it bled, then watch the slave operation while someone works the clutch pedal. The piston on the slave should extend and push the clutch fork enough to disengage the clutch.

You most likely have a hydraulic clutch. Thus either the master or slave cylinder would have to fail to cause the problem you describe.

This may be two possible issues. If your transmission grinded in the past your transmission may have finally given up the ghost. Also your clutch disk may be broken or worn to the point where you can no longer shift. It seems like the latter your going to have to replace your clutch if your a big on doing it yourself a clutch kit is 400$ at autozone. It may be cheaper online good luck I hope this helps

IF you have bled the clutch system and managed to get a firm clutch then the clutch plate has been installed back to front and the clutch center is hitting the bolts that hold flywheel onto the crankshaft. If you have no not got a firm predal pressure replace the clutch master cyl

Checked the clutch fluid level in the slave cylinder?

Your truck has a hydraulic clutch release system, you have a problem in it due to a leak in the slave or the master cylinder, The slave cylinder which is the one that leaks most often is inside the bell housing and it requires the ****** be removed to replace it.

did you check the fluid in the clutch master cylinder

sounds like your clutch master cylinder or slave is no good. do your self a favor and replace them both if you are going to be replacing them.

There is a return spring that lifts the clutch pedal back to the original position. It seems that the clutch return spring has got disconnected. The pedal will do its job of disengaging the engine from the gear box, but will not offer any resistance to the foot and thus give an impression of doing nothing. So, that spring should be set right. For this the clutch housing will have to be opened and the spring reset.