How does a slave cylinder go out?
 

How exactly does it feel when a slave cylinder finally goes out? Is the clutch/brake system all that complicated?

My clutch goes to the floor and stays there, but the reservoir is full. I know my slave cylinder is leaky (ordered a replacement already) but even leaky it still worked as long as I kept the tank full.

Is there another thing that goes out on these things pretty often that I should check while I'm in there? :helpsign:

Re: How does a slave cylinder go out?
 

Fetch, When the slave cylinder fails, the clutch won't release anymore. Your small leak probably just became a big leak and drew air into the system which means no more hydraulics to work the clutch. Check the line from the master cylinder to the slave cylinder. It has a rubber section which can also leak. Inline Tube sells a replacement line for $45 or you might have one made locally.
These trucks are not complicated compared to new ones. Of course when you add years of caked on grease, rusty bolts & nuts, wasps & mud daubers etc. things can get a little challenging. An original GMC service manual is worth the money too.

Re: How does a slave cylinder go out?
 

Air in the line was exactly what it was, thanks Snazzy! After a couple of days of having a full master cylinder gravity did its thing and my clutch works again!
I have a replacement slave cylinder on the way.